porting a 064 hybrid.

[jmssaws]

When I started building pipes for a lot of racers I have learned a lot of things....five cubes like a lot of rpm....stroker 3120s on nitro don't turn the rpm that you think they do

A short bar saw is kinda out of my element, I'm curious if a strong long bar saw with a big sprocket is faster or slower than a big rpm saw. Sorry for all the questions guys.

 

[tree monkey]

Didn't get a chance to work on it today.

ya so is it done yet? huh huh is it is it?

 

[drf256]

Which one though?


Don't madsens have the formula to calculate chain speed on there site?

There has to be a point where tourqe will out weigh rpm. I'll take the torque with a bigger gear. I think. Lol

I need to do some testing

I don't think there's an answer.

Gonna depend on chain and raker depth. Resistance at rpm.

And torque moves the chain, but hp is torque at a given rpm.

 

[SquareFile]

Rpm out of the wood don't mean anything. Its what it holds in the cut. Bigger gearing is not always needs to be done with larger saws. But you have to know what your doing with a chain if so. Measure your sprockets and tach it in the cut. Here's the formula for sfpm/ surface footage per minute. Then you'll know which one has the highest chain speed.

[RPM X diameter of sprocket] x 3.1416 ÷ 12= sfpm

 

[drf256]

There a builder on the AS that holds "RPM in the cut" to be his ultimate goal. His chains seem to spin and spin, but not cut that fast.

So I guess a torquier low rpm saw will pull the 10 pin with a high raker chain as fast the high rom saw with the smaller 8 pin and a low raker chain.

I see I've been a big help.

 

[spencerpaving]

A short bar saw is kinda out of my element, I'm curious if a strong long bar saw with a big sprocket is faster or slower than a big rpm saw. Sorry for all the questions guys.

Hmmm big bar......could always machine a new flywheel out alum but twice the weight. ...kinda like a john deer b....guys out west race with big bars and the timing numbers aint alot diff from a good woods port

 

[spencerpaving]

Hmmm big bar......could always machine a new flywheel out alum but twice the weight. ...kinda like a john deer b....guys out west race with big bars and the timing numbers aint alot diff from a good woods port

Unless on pipe of course

 

[Deets066]

I think your on the right track with the numbers you had in mind J

 

[drf256]

Why does one run numerically higher transfers (physically lower and more blowdown) on saws with higher exhausts?

Does the exhaust not close fast enough to trap mix from a lower numerical transfer?

 

[jmssaws]

I just don't like a high exhaust,98 is high to me.

 

[Deets066]

I just don't like a high exhaust,98 is high to me.

Kevin's non-decomp is at 97, his is a beast too

 

[SquareFile]

There a builder on the AS that holds "RPM in the cut" to be his ultimate goal. His chains seem to spin and spin, but not cut that fast.

So I guess a torquier low rpm saw will pull the 10 pin with a high raker chain as fast the high rom saw with the smaller 8 pin and a low raker chain.

I see I've been a big help.

What does the "AS builder" have to do with this? Watch some race saw videos. They hold high rpm in the wood. Maybe cause that's there peak power.

 

[jmssaws]

Kevin's non-decomp is at 97, his is a beast too

My 660 runs great at 98 with good compression but it ain't even close to the 066 at 101,no rpm difference between the two. 066 is finger ported with less blow down though. Intake is 84 on the 660 and 78 on the 066

 

[tree monkey]

is it done yet? is it? is it? is it?

 

[jmssaws]

Almost

 

[tree monkey]

now? now is it done? now? now? soon? how long? now? soon?

 

[jmssaws]

I'll finish this weekend.

What kind of compression do you think scott? I'm thinking 210 to 220, exhaust at 164 that's about all I'll get.

 

[tree monkey]

well ya just gotta make it work with what ya got. are you using the stock boot and wj carb?

 

[Definitive Dave]

now? now is it done? now? now? soon? how long? now? soon?

don't you be distracting him while he is grinding on my beautiful jug!!!!!

 

[Definitive Dave]

hey if you want a velocity stack Jason , say the word and I will get it to you with a green meanie, squarefile built me some and they are purty