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Topics - bimmerbaz

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Driveline / Gearbox Idea
« on: September 26, 2008, 10:53:17 pm »
Just read a post by george about welding a gear to the output shaft of a gearbox to get the right ratio. Heres a thought what if (because here in NZ peerless 700 are hard to find) i got a normal transaxle and removed the axle and diff then modified the housing to make it like a 700 .Then put a sprocket onto where the brake was to allow a drive to the live rear axle. Has anybody done this before to allow a chain drive to a live axle.Just looking at options as always.

Cheers 8)

Tires / Why 6" rims all round
« on: September 22, 2008, 04:26:12 am »
Hi Guys,

Can any body tell me the reason why you run 6" rims front and rear, instead of 8 " in the rear. Here in NZ its seems really hard to track down any 6" rims that are used on karts or other stuff that are wide enough.Any toughts would be appreciated

Cheers 8)

Briggs Flathead / approx horsepower
« on: July 19, 2008, 01:31:02 am »
hi guys,

does any body have approximate hp figures for a upgraded 12.5 flat head. If you do valves , exhaust , cam etc ?

Cheers 8)

Briggs Flathead / adjustable timing
« on: July 19, 2008, 12:56:02 am »
Hi Guys,

Whilst recovery from surgery for a hernia i had a thought about adjustable ignition timing related to rpm and load. Has any one carried out such a thing?. I can build a programmable map for rpm and fit a reluctor sensor to the  fly wheel also most cars have a map sensor which i can modify to work with the module. I know you guys use timing adjusters on the flywheel but they are limited to a set rpm and so if you have extra load or a different rpm they must not produce the optimum timing. I can build the modules required for low cost and then run a hi power coil which would also aid in combustion. What do you guys think?

Cheers  8)

Briggs Flathead / 28ci ohc vs flathead 28ci
« on: June 30, 2008, 01:27:22 am »
Hi Guys,

I have driven a mates mower with a 28ci ohv and the tourque difference is very noticable.His motor seems much stonger than the flathead but the ci is the same. My motor is a 28ci flathead with the valves refaced and ports cleaned up, i put a pipe nipple in the exhaust and matched the size to the exhaust pipe . I then run a pipe same size to the rear wheel. I have bored out the idle jet and richened up the mixture.My mates motor is standard except for a bigger jet in the carb. Is the difference in power just because of the ohc and do you think modding the flathead will gain more power or should i look for another motor maybe a 31ci or a twin. Your thoughts would be most appreciated.

Cheers 8)

Post Your Video / New Zealand Mower racing Demo
« on: June 19, 2008, 05:28:31 am »
Hi Guys ,

Just thought i would add a couple of short videos i took at the ag feildays last week. You can see that we have a mowers in all shapes and sizes. My one is the blue one with "superchips " signwritten on it driven by the local celebrity of screen and radio Adam.

Cheers guys  8)

Driveline / 8n inch vs 6 inch wheels
« on: June 14, 2008, 10:21:56 pm »
Can you tell me the advantage/disadvantage of running 6inch rear wheel instead of 8 inch?

Cheers 8)

Post your Pics! / pictures of my completed mower
« on: June 09, 2008, 08:06:40 am »
Just thought i would post the pics of my finished mower on here. I also have a build thread with the details of the mower.

Cheers  8)

Briggs Flathead / oil grade
« on: June 03, 2008, 02:43:09 am »
Can you tell me what oil grade you run in your 12hp mowers?I was thinking of using a multigrade synthetic but thought i would ask what you guys run first?

Cheers 8)

Briggs Flathead / LMT Walbro rejetting
« on: May 12, 2008, 03:18:39 am »
I would like to get hold of the conversion for the LMT carb so that ican adjust the main jet from the outside. I gather this is better than drilling out the jet and testing . The only problem is that i live in New Zealand. Can any one help with an option ?.Cheers 8)

Briggs Flathead / model 282707 12hp
« on: May 05, 2008, 07:21:08 am »
Hi Guys,

Does anybody know where i can down load the specs for this engine ,eg head tourque , tappet clearances etc. Maybe there is an online source for a repair manual . Down here in NZ there at as much stuff easily available .

Cheers 8)

Driveline / 12hp pully set up
« on: April 27, 2008, 12:34:12 am »
Hi There,

I would like to know what ratios you guys are running . I have a 5.5 inch on the motor amd a 6 inch on the jack shaft .The input shaft on the trans has a 3 inch pully on it giving me a ratio of 1 to 1.8.
When in 4th grear i have a ratio of 11 to 1 and in 5th gear it is 9 to 1.
Any suggestions for pully sizes to get best performance from motor it seems to not have a lot of power with this gearing.
cheers 8)

Chassis / steering help needed
« on: March 07, 2008, 12:56:39 am »
Hi guys,
I am having a bit of a problem with the steering set up on my mower. I have to clear the pully at the front and to do so i need to move the piviot point of the bell crank forward. This means that the steering looks kind of funny compared with most of the other one ones i have seen.I have also tried different lenth bell cranks and have drilled holes in the arms to try different positions however i dont seem to get enough movement on the out side spindle. I know that one moves more then the other (akerman effect). Could you maybe look at the sizes of the belcranks and let me know what you guys run or maybe a way to get around this problem.

This is my trial bell crank moved to far back it would hit the pully if it was here

This is the set up to give you an idea of scale

This is wear the bellcrank needs to be to clear the pully.
This may work fine but i would like some input from people that know more than i

Briggs Flathead / Timing advance
« on: February 18, 2008, 04:01:07 pm »

If i sloted the holes or made a bracket to allow me to move the igniter pick up on the motor to the advance side and made sure the airgap was right would that allow me to change the timing on the motor?.

Just a thought.

Cheers 8)

Driveline / Right foot clutch
« on: February 08, 2008, 03:47:14 am »
I have spent a long time reading the posts on here and am currently building a mower (see build thread).
I am about to build the clutch and i noticed that most of the mowers appear to run a right foot clutch. Is there a reason for this as normally the clutch is on the left foot . I had planned on a left foot clutch and right foot brake.Can you shed some light on this for me.

Cheers :bash:

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