Heymow - Lawnmower Racing Forum
Engine Help => Briggs Flathead => Topic started by: Rooster on January 11, 2011, 06:27:23 am
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Have had several guys ask about this lately, so I decided to post some pics of how I modify Opposed twins for better oiling.
(http://i288.photobucket.com/albums/ll179/Roosterlew/Pics%20on%20Heymow/th_Stage1crank-2.jpg) (http://s288.photobucket.com/albums/ll179/Roosterlew/Pics%20on%20Heymow/?action=view¤t=Stage1crank-2.jpg)
(http://i288.photobucket.com/albums/ll179/Roosterlew/Pics%20on%20Heymow/th_Stage1crank-.jpg) (http://s288.photobucket.com/albums/ll179/Roosterlew/Pics%20on%20Heymow/?action=view¤t=Stage1crank-.jpg)
(http://i288.photobucket.com/albums/ll179/Roosterlew/Pics%20on%20Heymow/th_Stage1crank-5.jpg) (http://s288.photobucket.com/albums/ll179/Roosterlew/Pics%20on%20Heymow/?action=view¤t=Stage1crank-5.jpg)
The first thing I do is the crank. I remove material above the crank pins. Later you will see, with the rod on there it creates a sort of "shelf" . The slung oil comes down and gets into the rod here.
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What are you hidding under the rag!!!LOL
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Looks like a OHV to me? Maybe he has seen the light?
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I know what it is....LOL I just want him to spillthe beans. LOL
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Beans, beans, the musical fruit... :lol:
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Those were just there to keep the grease off of the v-blocks.
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I SEE AN TABLE. NO V BLOCKS. :bash: :D
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No grease on the layout table :bash:
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do rooster how do you grind it away, just take a grinder to it? about how much do you cut off? I wasnt to make my oppy last, untill i get rods anyways, any other tips?
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the bottom of the crank pin radiuses u to the side, I grind it down to that radius.
I cut it first with the lathe, since it was already in the lathe anyway....
I SEE AN TABLE. NO V BLOCKS. :bash: :D
They are under the rags
No grease on the layout table :bash:
Thanks to the rags!
you guys have caught me, my big secret the opposed twins is....
wait....
are you ready for it....
Red Rags
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WORKS FOR ME. >:D
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My opposed crank doesn't look like that, mine is all shiny and kinda chromey lookin......LOL
Lester
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Any pics of it Les?
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Any pics of it Les?
A few mortals might get a peek this spring when i go through it...... LOL.
Lester
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(http://i288.photobucket.com/albums/ll179/Roosterlew/Oppy%20Parts/Top%20Secret%20Crap/th_Stage-1Crank.jpg) (http://s288.photobucket.com/albums/ll179/Roosterlew/Oppy%20Parts/Top%20Secret%20Crap/?action=view¤t=Stage-1Crank.jpg)
OK, fine...that's what was under the rags.
So there you go.
Now if you do this to your crank without what I do to it afterwards.....good luck keeping that engine together!
Don't bother asking what I do afterwards, i ain't telling!
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Now the rods.
(http://i288.photobucket.com/albums/ll179/Roosterlew/Pics%20on%20Heymow/th_OilMods002.jpg) (http://s288.photobucket.com/albums/ll179/Roosterlew/Pics%20on%20Heymow/?action=view¤t=OilMods002.jpg)
First I drill out the oil hole larger, I use a 9/32.
Then I put a large chamfer on it, creating a funnel of sorts to catch more oil.
(http://i288.photobucket.com/albums/ll179/Roosterlew/Pics%20on%20Heymow/th_OilMods001.jpg) (http://s288.photobucket.com/albums/ll179/Roosterlew/Pics%20on%20Heymow/?action=view¤t=OilMods001.jpg)
Then I drill a 3/16" hole in the center of the cap, no chamfer here.
The hole pictured is way too big....I dunno what I was thinking when I drilled it!
(http://i288.photobucket.com/albums/ll179/Roosterlew/Pics%20on%20Heymow/th_OilMods005.jpg) (http://s288.photobucket.com/albums/ll179/Roosterlew/Pics%20on%20Heymow/?action=view¤t=OilMods005.jpg)
You can see where the grinding on the crank helps now, leaving a "shelf" to catch oil on top of the rod.
Disclaimer, I did not pay any attention to how I installed this rod, nor is it torqued down.It was done purely for photo use. It may or may not be installed correctly
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Finally the pan.
There are 2 oil valleys that allo the oil to get down to the lower main.
using a die grinder and a 1/4 ball, I open those up just a bit.
(http://i288.photobucket.com/albums/ll179/Roosterlew/Pics%20on%20Heymow/th_OilMods007.jpg) (http://s288.photobucket.com/albums/ll179/Roosterlew/Pics%20on%20Heymow/?action=view¤t=OilMods007.jpg)
(http://i288.photobucket.com/albums/ll179/Roosterlew/Pics%20on%20Heymow/th_OilMods006.jpg) (http://s288.photobucket.com/albums/ll179/Roosterlew/Pics%20on%20Heymow/?action=view¤t=OilMods006.jpg)
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PM SENT
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THANKS FOR THE TIPS, THE CRANK LOOKS GOOD! ANY MORE IDEAS YOU WANT TO SHOW US? YOU SHOULD MAKE A DVD! [THINK ABOUT IT]
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THANKS FOR THE TIPS, YOU SHOULD MAKE A DVD! [THINK ABOUT IT]
He made a video on lapping valves, but I lost it.
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He made a video on lapping valves, but I lost it.
Lol...
THANKS FOR THE TIPS, THE CRANK LOOKS GOOD! ANY MORE IDEAS YOU WANT TO SHOW US? YOU SHOULD MAKE A DVD! [THINK ABOUT IT]
I didn't WANT to show you this, lol...I just answer when asked, or chime in when I think I can help. Not starting a school, or hanging a shingle. I'm not good on video....
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OH COME ON,A BIG ROOSTER ON THE FRONT COVER? :lol3:
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lol
And how would the introduction go...
Hi, I am Rooster and I am here to show you how I build engines.
Now I have never won anything important, no national wins, didn't even finish finals, but hey I got your money didn't I...
LOL
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WORKS FOR ME. VERY FUNNY. :lol:
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Where do I send payment to????
Sent from my Droid using Tapatalk
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payaple to:
RoosterRippedMeOff@stolenmoney.com
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LMAO
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Rooster, I was just wondering........is all the extra oil to the journals to keep the crank from getting rusty when its submerged? :hmmm: :rofl: :pffftt:
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Lol...Been missing ya buddy welcome back!
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YOU DON'T HAVE TO SHOW YOUR FACE OH I MENT BEEK, YOU JUST NEED TO GET A MODEL AND YOU CAN NARATE! LOL
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ROOSTER,YOU KNOW EVERYBODY WENT TO YOUR RIPPED OFF LINK. :badgrin:
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OH THATS WHAT THAT WAS, THOUGHT IT WAS CHICKEN SCRATCH! LOL
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YOU DON'T HAVE TO SHOW YOUR FACE OH I MENT BEEK, YOU JUST NEED TO GET A MODEL AND YOU CAN NARATE! LOL
Finally, someone with a good idea!
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how bigg are the holes on the rod cap
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3/16
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ok also i was woundering if you do the same thing to for a single flatty 28 ci thanks
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Dont think it would hurt.
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Here is the best way to make sure the oil gets to the right areas.
(http://i1209.photobucket.com/albums/cc382/THawley69/Mower%202011/OilModOpposed.jpg)
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Show off
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Lol
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will a bigger oil filter help performance or hurt it? i took of the old briggs one and put a fram oil filter for a car in is place. its the same diameter just bout twice as long
thanks
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Oil filter will not make any difference
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oh alright... didnt think so. i was just wondering if the different size did anything
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(http://i288.photobucket.com/albums/ll179/Roosterlew/Oppy%20Parts/Top%20Secret%20Crap/th_Stage-1Crank.jpg) (http://s288.photobucket.com/albums/ll179/Roosterlew/Oppy%20Parts/Top%20Secret%20Crap/?action=view¤t=Stage-1Crank.jpg)
OK, fine...that's what was under the rags.
So there you go.
Now if you do this to your crank without what I do to it afterwards.....good luck keeping that engine together!Don't bother asking what I do afterwards, i ain't telling!
so what your saying is dont grind the crank to for oil mods because we dont know what the next step is ? :worried:
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No, it is fine to do the oil mods, just don't go cutting the weights like I did.
That is the reason in the first photos I had the rags there. Those are not oiling mods.
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didnt catch that the first time i look at the pic thanks for clear'n that up
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Rooster how much weight did you loose from the crank. It looks killer. Had to make a big difference in how quick it revs. I like it.
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Don't know yet? Have not run it yet and not finished with it yet, lol!
Doing some more work on it tonight then hopefully I can weigh it.
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well anything new too see besides red rags!
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Nothing new, been working on other parts of it...wouldn't wait to see updates though, lol!
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OK JUST CHECKING! I BET YOU THOUGHT WE ALL FORGOT! ;)
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could i still do this with a single(i have an extra in the shed) :P
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YOU WILL HAVE TO HAVE IT BALANCED AND I AM NOT SURE YOU WILL GAIN BECAUSE OF ADDING WEIGHT. THE OPPOSED HAS NATURAL BALANCE, AS LONG AS BOTH CYLINDERS WEIGHT [PISTONS & RODS] ARE EQUAL. YOU WILL NEED TO TALK TO THE BALANCER PERSON TO SEE WHAT YOU CAN DO.
ANYTHING NEW JON! WE DID NOT FORGET LOL!!!
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Nothing new, too busy racing and doing work for other guys.
The opposed crank is actually even harder to balance than a single. With the two crank journals and the weights so far apart if you get them off then it will twist on the crank ...kind of hard to explain. I talked with Tommy "The King of all things Balanced" , and he talked to them reallly smart fellars he knows, and the only way to properly balance an oppy crank is on a computer balancer...
As for the singles...any weight you take off of one side has to come off of the other, on the Oppy i do this by drilling the crank pins. Thwe opposed has 1-5/8 crank pins - HUGE! The singles are prone to breakage without a hole in them, I would not suggest that!
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so your saying if i do these mods i have to have my engine rebalanced?
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No, these can be done without balancing the crank (oil mods)
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I liked your little trick of drilling the oil groove longer for the crank bearing in the pan. I'm guessing this would work for just about any engine, right?
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I liked your little trick of drilling the oil groove longer for the crank bearing in the pan. I'm guessing this would work for just about any engine, right?
Yup!so your saying if i do these mods i have to have my engine rebalanced?
No, these can be done without balancing the crank (oil mods)
Yeah sorry, we got off talking about the crank, lol. no you won't have to re-balance for the oil mods to the block. However with a single If you do the crank grinding I definitely would!
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Hey Rooster, don't appologize for giving out great tip and info.
Some guys like me read almost everything that comes along
just so info like that on the cranks doesn't get missed.
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now rooster did you do this with stock rods or a arc rod?
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With the splash system I would do it no matter arc or stock.
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Both ways Mike.
Now I did not do any oiling mods to the ARC rod though, they are fine as they come.
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ok i did this to my 20hp single i ran the engine at 2000rpms then i broke it loose with my tach hitting 5500 rpms with a big grin ;)
Thanks
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OK I'LL ASK, THE REAR TIRES OR THE ENGINE BROKE?
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well engine has held up well i dropped the pan after the test and saw no ware on the bearings or anything of that matter. i can risk breaking motors ive got plenty laying around but i dont like to but some times it happends
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Anything new under those rags?
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(http://i288.photobucket.com/albums/ll179/Roosterlew/Pics%20on%20Heymow/th_OilMods001.jpg) (http://s288.photobucket.com/albums/ll179/Roosterlew/Pics%20on%20Heymow/?action=view¤t=OilMods001.jpg)
Then I drill a 3/16" hole in the center of the cap, no chamfer here.
The hole pictured is way too big....I dunno what I was thinking when I drilled it!
I screwed up here guys, thanks to meanmachine for catching this! If anyone has made this mod already I do apologize, but I think that much hole will cause problems! I don't know if it was a late night, grabbed the wrong drill or what but that is not right!
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I screwed up here guys, thanks to meanmachine for catching this! If anyone has made this mod already I do apologize, but I think that much hole will cause problems! I don't know if it was a late night, grabbed the wrong drill or what but that is not right!
np i sold my 20hp single that i did this to to a kid lol
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np i sold my 20hp single that i did this to to a kid lol
SO your Idea of No Problem is selling "a kid" the engine you used my bad advice on which could very well be about to come apart?
I bet he will think very highly of both of us!
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How big of a hole you thinking? Looks like I need to pull my buddy's motor apart now lol
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How big of a hole you thinking? Looks like I need to pull my buddy's motor apart now lol
The hole size I quoted was correct, 3/16...but the hole in the pic I had to have grabbed the 9/32 drill or something!
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Whew! I put 3/1 in them... I always thought that hole looked bigger than 3/16 lol
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SO your Idea of No Problem is selling "a kid" the engine you used my bad advice on which could very well be about to come apart?
I bet he will think very highly of both of us!
still running fine he is using it as a puller and i dont think i told him i got the idea from ROOSTER i said i found the idea off of heymow.
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9/32
[might what to change this to 3/16 also/quote]
how bigg are the holes on the rod cap
3/16
this is on page 3 just trying to help
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3/16
this is on page 3 just trying to help
I fixed it.
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:bash: that sucks, I did it with the 9/32nd hole, so now my caps are shot... new motor time or caps whatever comes cheeper
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When a connecting rod is made the cap is bolted on then it is bored and honed to size,you can't just change the cap and have the rod be round,you need to change the whole rod
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there is a rod that is shorter and wider thats why some people machine down the cranks like that
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WELL ROOSTER ANYTHING NEW UNDER THEM RAGS? BET YOU WE FORGOT! LOL WHAT ABOUT THAT VIDEO! :badgrin:
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Rooster,after you do all this stuff why do they still go slow?
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Like I have said before, no love for oppy's! LOL
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Rooster was going to build something with rocker arms but it hasn't happened yet,I was going to help him,he could still use the oppy when he wanted to go slow
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Or is he trying to put rockers on an oppy? LOL
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Rooster,after you do all this stuff why do they still go slow?
If I knew the answer to that...they wouldn't now would they!
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Rooster,after you do all this stuff why do they still go slow?
I know I know.... because it is apposed to running. .... :D >:D
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All kidding aside,they have a pretty good sound when they are going around the track slowly
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I know I know.... because it is apposed to running. .... :D >:D
I have never known anyone who could keep them from running, dang things never quit!
Oh wait...there is one guy that they wont stay running for...YOU!
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I have never known anyone who could keep them from running, dang things never quit!
Oh wait...there is one guy that they wont stay running for...YOU!
:lol:
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Shoot fire man I bought a brand new one it mowed one time and went to the scrap yard. Junk I tell ya
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Like I say "oppys get little or no respect" LOL! even when they do run good!
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even when they do run good!
When is that? Like the second Tuesday of next week type thing?
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YUP! LIKE I SAID NO LOVE LOL!