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Messages - JGC403

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Briggs Flathead / Briggs Opposed Twin Crank and Cam Timing?
« on: December 04, 2019, 02:24:13 pm »
I'm re-assembling a Briggs opposed twin engine.  For the crank and cam timing do you just align the dots on the cam and crank gear?  Is there a number one cylinder?  Been trying to find the answer on google with no luck.


Briggs Flathead / Don's motor 101 dvd?
« on: October 25, 2018, 10:12:31 pm »
Anyone know of anyplace to pick up his motor 101 DVD?  I seen it mentioned in a couple of threads and wanted to get it before working on my opposed twin.  I tried getting in contact with him with no success.

Briggs Flathead / Re: Briggs 40ci Engine specs
« on: March 15, 2018, 07:21:08 pm »
I have exhaust header design software.  All of the above info is needed for it.  I have seen a couple threads on exhaust length and diameter, trying to see how close those are compared to the software. 

Briggs Flathead / Re: Internal Engine Coatings
« on: March 15, 2018, 03:09:59 pm »
Guess no one has tried it.  Been doing some more research and found that some people have done these coating on air-cooled VW engines.  So it shouldn't do any damage to the Briggs.  I'll try them out and report back if anyone is interested.  I'm using this engine as a guinea pig to see how durable the coatings are.  I'm going to get a cylinder head temp prob that goes under the spark plug and gauge and an EGT temp gauge, I'll do a before and after to see if there is a difference in temperature with and without coatings. 

Briggs Flathead / Re: Briggs 40ci Engine specs
« on: March 15, 2018, 03:02:42 pm »
Yea, haven't torn it apart yet.  Most of the information I need i can get once I pull it apart, was just hoping someone already new most of the answers.  The camshaft specs will take some time to figure out, but I think I can do it with a degree wheel and dial indicator.

Briggs Flathead / Briggs 40ci Engine specs
« on: March 13, 2018, 11:01:31 pm »
I'm having a difficult time trying to find engine specs on these engines.  The specs I'm looking for aren't published or they aren't consistent from different places.

Engine ID 402417  0660  01

Bore: 3.438"
Stroke: 2.156"
intake valve lash: 0.005"
exhaust valve lash: 0.008"

I need:
connecting rod length
compression ratio
Intake and Exhaust valve diameter
Intake and Exhaust valve steam diameter
Stock camshaft specs:
-valve lift
-duration @ 0.050"
-degreed centerline
-exhaust port length

I would appreciate any info I can get.

Briggs Flathead / Internal Engine Coatings
« on: March 13, 2018, 01:21:33 pm »
New to the forum.  Looks like this is the place for knowledge on these B&S opposed flatheads.  I have been reading a lot of post today and learned a lot.  I have a 40 c.i. engine I'm building.  Its out of an old Craftsman GTV/16 Varidrive.  402417  0660  01.  Oil mods are at the top of my list. 

Would thermal barrier coatings work in an air cooled engine?  Thermal barrier coatings would go on the top of the piston, combustion chamber and valves.  Could also coat the inside of the exhaust ports.  The coatings are usually used in liquid cooled engines, just wondering if there would be a difference with an air cooled engine.

Dry film lubricant on the piston skirts I don't foresee a problem with. 

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