Engine Help > Briggs OHV & Vanguard
44CID Intek
larry crouch:
George, Don, Just took a 44CID Intek apart and the pistons were cupped
downward like a 35 or 38.5 Vanguard. Does Briggs make a flat top or domed piston for these? Also cut heads to around .0080 is that enough
considering the heads are open chambered and not closed?
George Herrin:
Briggs doesn't make a flat top. NOW what we need is a longer rod and we can cut the pistoon as we do with the Vanguard (hint hint TOM). Course one can always go to Wiesco or some high end piston manufacturer and have custoom pistons made. We are building a 44 at EC and its heads are cut more than .080. Its a customer motor so I cannot reveal the exact amount.
larry crouch:
You can get the piston with no wrist pin holes, but you have to be perfect when you get them machined. Ronnie from Cheraw S. C. builds motors for a multitude
of racers in all kinds of racing gave me the company's name but I'm not sure if i'm smart enough to to get the pin in the right place.Since I opened this can, if you cut the heads more than a 100 do you change push rods because of the rocker angle. Performance V-twins say's you need to. I'm a little out of my league when it comes to rocker angle. Anyway you have so much room in the heads for shaving who knows when it's enough.
I think you could make it a closed chamber with a little fill in by a good welded.
George Herrin:
When one shaves an OHV yea rocker geometry is an issue. And to correct that yes it requires shortning the push rods. With the intek or any other V-twin the bigger issue with shaving heads is still getting the intake to fit correctly. Keep that in mind. Also understand compression by shaving heads is not the key to making horsepower. FLOW is where its at in heads the carb, and the exhaust.
Don Gienger:
Ok Here is my question. Why?
I mean all I read is Flow flow flow. Then I hear shave heads .020 to .150 on all the Briggs motors out there.
So what gives?
If the piston is dished so what?
I am not being mean here but I am so comfused. I watched the Stabil finals last night again. I watch the BP class and watch Robert Sparbel finish 8th. No biggy right.
I also know I finish 6th in Mendota IL last year too. So................
It is not that my motors are not fast. It is not the chassis either. Sometimes it just comes down to the start and when you start 15 or lower and end the race 6th or 8th that means something too right?
What I am getting at is that is with Inteks with the Heads NOT shaved. 8:1 motors running with all these guys that cut and cut again.
This is with a 90% stock motor. No valve changes and nothing wild.
Simply a good strong build.
There is much to talk about the swirl that happens in the cylinder and there is Vortec ideas and all too. Snowmobile guys know alot about this too. The sqwish if the fuel and air is very important and how it is done is important too.
Knowing sqwish and how it works can yeild much mower then shave shave shave ever will.
So what I am reading is this. If I shave my heads I will be #1??? Why is it always come down to one or two things will kick someone's grass??
Again sorry that this message sounds a bit off. I am a bit crabby this morning and mostly just confused. It is not that I don't know what the answers are I just don't understand how folks come up with what is the winning thing.
Again Sorry
Don
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