Need help building stock altered engine

[dvogtvpe]

3.250 crank. you'll want to go .030 os due to the fact that their are some very nice ring packages available and a good pin hieght available. you'll want to stay with either a 6 in rod and a 1in pin hieght piston or you can go with a 6.125 rod and a .875 pin hieght. ether combo gives you a good rod ratio and and the piston will be flush.

[J-Mech]

Originally Posted by austin8214

After market rods are available in varying lengths to create piston pop out. JE and Diamond make after market pistons with varying pin heights too.

Yeah, I know that. He said he doesn't know what crank size to use. I see now, he also said rod. But, still with stock stroke....... kinda makes the choice made as far as crank is concerned.

[Cub Cadet 1650]

What can I do for carbs?

[J-Mech]

Well, your rules say you can run one up to a 1.2" venturi size. What do you want to know? The carb is the last part of the build. You build it to handle the internals. Sooo...... what are you going to do with the internals?

Listen. I know your just young, and you want to do this. But you really need to understand how to build an engine before you build one. You either need to find someone to build you a motor, or go find someone to HELP you build the motor. I really don't think that it's fair, or time effective, for us to walk you through the entire process. Or what to pick. You need to decide on a budget, and build based on that. Nothing we say matters if you can't afford it. Make some decisions, and then proceed.

Your in Wisconsin. Why don't you contact Don Vogt. (dvogtvpe on this site.)

[Cub Cadet 1650]

I know Don and I did go to school for small engines but I'm just confused.

[austin8214]

It's really best to contact someone with the experience building them. Call Lakota or Vogel or even Don Vogt as suggested. They have had multiple engine with different rod and piston combinations on the dyno. They know what works. Pay one of them to build one and you will be money ahead in the long run.

[J-Mech]

Originally Posted by Cub Cadet 1650

I know Don and I did go to school for small engines but I'm just confused.

Building a custom engine is NOTHING like working on a stock engine with written specs and book for parts. It separates the engine builders and the parts changers. It takes years of experience to know how to do it right, and well. It's not something you learn quick, or overnight. I know mechanics that are good who have been doing it for years that wouldn't know what to do to build a custom engine.

[J-Mech]

Originally Posted by austin8214

It's really best to contact someone with the experience building them. Call Lakota or Vogel or even Don Vogt as suggested. They have had multiple engine with different rod and piston combinations on the dyno. They know what works. Pay one of them to build one and you will be money ahead in the long run.

[austin8214]

Originally Posted by J-Mech

Yeah, I know that. He said he doesn't know what crank size to use. I see now, he also said rod. But, still with stock stroke....... kinda makes the choice made as far as crank is concerned.

I guess I assumed he was talking about crank to rod ratio.

[dvogtvpe]

We used to always run allot of piston pop out. but one day we had a degree wheel on a motor and started looking at where the piston popping out started to restrict flow at the top of the stroke. once we saw how many degrees of rotation the piston was up out of the bore we started going back to flush or closer to flush.

the cam lift rule is kind of funky .475 , an SA is .330. the limit of valve size is weird to

gotta use my little makin power guy!!!!!!!