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Old 08-05-2003, 04:28   #1 (permalink)
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ACL race series pistons

Has anyone used these pistons they look pretty good all individually inspected and stamped four left-hand side four right-hand side with tapered pins ive been given a good price for a boxed set of pistons and rings .0030 oversize.
The motor's not getting forced induction or nitrous so theres no need for forged pistons.
aiming for around 250rwkw
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Old 08-05-2003, 05:51   #2 (permalink)
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Re: ACL race series pistons

I'm running them in the engine i just had built for my XR... What do you want to know??
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Old 08-05-2003, 09:01   #3 (permalink)
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Just a couple of questions, I was told the block should be bored/honed to give .002 clearance sounds pretty small to me is this right ? or should it be a little larger.
How much revs are they good for ?
I know its a bit hard to tell depending on individual application but How much valve lift are you using? the cam im looking at has .517 lift.
any info would be good thanks
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Old 08-05-2003, 20:10   #4 (permalink)
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Re: ACL race series pistons

It's not just the valve lift you have to consider, its the total timing.Size of valve to piston notch etc.I think they are hypo pistons and they can run tight clearances as they don't expand much..517 is not alot of lift.But in all cases these need checking when asembling engine...The roller lifters are really only good for about 6500rpm any way...Too heavy...
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Old 08-05-2003, 20:44   #5 (permalink)
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Re: ACL race series pistons

I went and bought them this morning ($350)and got my engine builder to hone the bores for the correct clearances
I thought as much about the lift issue and will be checking with the clay method when assembling the engine.The cams an iskey with 232@50 hydraulic flat tapet as the motor is 1970 vintage, a roller cam would be nice but outside my budget at the moment.should get about 10-1 comp with then heads i have at the moment
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Old 08-06-2003, 06:04   #6 (permalink)
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Re: ACL race series pistons

i don't know about how much clearance the bore to piston has, that was all done by the machine shop. I had 15 thou taken off the deck and have .564 lift.
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