pistons etc
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My last engine used ACL race series pistons. My opinions on them isn't very good. The skirts collapsed causing what you'd call piston slap. My old engines bores showed some real ugly marks.
They lasted 25,000k's and I noted signs (smoke out the tailpipes) by 30,000k's they were gone. That engine spent most if it's life around 3000-4000rpm. Only went higher when I raced it. Cruise rpm for me (100kph) was 3350rpm.
They lasted 25,000k's and I noted signs (smoke out the tailpipes) by 30,000k's they were gone. That engine spent most if it's life around 3000-4000rpm. Only went higher when I raced it. Cruise rpm for me (100kph) was 3350rpm.
I used them in the first 302 that i built some 9 years ago as brenx said they only lasted 20-30,000 klm's and the motor only reved to 6000 rpm when raced and around 2500-3500 rpm daily driving. It all depends what your buget is and your going to do, do you want to rebuild in 30,000klms or not?
If money isn't a prob then go something better.
Mick
If money isn't a prob then go something better.
Mick
Have built one clevo with the ACL Race series, 351 with 302 rods.
Very nice. But admitedly, the engine has probably only done around 2,000kms as not long after it was built the owner end up in a wheel chair.
Fear not, he will be back in action with the XD this year, but with CHI's, nitrous and a nasty auto/diff combo :driver:
Few here reckon the aren't much chop so take some advice from these people. They've used them. Only thing is that some may have been harder on their gear than is led to believe. :shh:
Very nice. But admitedly, the engine has probably only done around 2,000kms as not long after it was built the owner end up in a wheel chair.
Fear not, he will be back in action with the XD this year, but with CHI's, nitrous and a nasty auto/diff combo :driver:
Few here reckon the aren't much chop so take some advice from these people. They've used them. Only thing is that some may have been harder on their gear than is led to believe. :shh:
If youre after the most longevity with the ability to give it a beating and not have to fear the consequences go for a quality forged piston, it may be a few hundred more upfront but the lifespan should be much better, and you have the peace of mind.
Having said that I've never run a forged piston engine yet and had good life from a std 302 piston set even with a greater than spec piston to bore clearance(it had been honed 3 times), but thats with a 302, the 351 is going to put more load onto the piston, in the end it ovalised no 1 bore, but that was 40 over with 3 hones on top of that, was a bit knocky.
Having said that I've never run a forged piston engine yet and had good life from a std 302 piston set even with a greater than spec piston to bore clearance(it had been honed 3 times), but thats with a 302, the 351 is going to put more load onto the piston, in the end it ovalised no 1 bore, but that was 40 over with 3 hones on top of that, was a bit knocky.
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