someone explain? P2W info?
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Honda-Tech Member
Joined: Nov 2003
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From: GTA Ontario.
someone explain? P2W info?
Hi, i asked for help on p2w clearance spec's for a build I did awhile ago.. I asked for some clarification on exactly why these guys said what they said but they weren't much help really. Just wondering if any of you guys can clear it up for me either way.
I always though drag race engines got much hotter then street driven engines (drag race engines usually make more power), thus why a lot of guys run like 5.5thous of p2w clearance on their 850+hp builds? I also didn't think break in was even really required, more of less a myth..? Usually just something simple before hitting up the dyno, mainly checking oil pressure/leaks.. then changing the oil etc. Don't most coatings wear off too? I though a big factor in piston expansion was just heat, caused by fuel (e98 vs c16 for example) or lean conditions, improper timing etc? I thought coatings reduced heat caused by friction which would be a small contributor to heat compared to other things?
Remember guys, I just do this as a hobby picking up good advice (try to) along the way, im not a mechanic or a engine builder, my car is just garage built. Im just trying to figure out whats up with their method.
I know most guys wont share a lot of this info, so im glad these guys told me what they did, however im guessing they didn't want to explain it any more in depth, so im hoping you guys can shed some light.
is built to go from the bench to the track with no normal break-in work. It's a very tight tolerance build, this is achieved using fully coated pistons, over sized high grade racing rings, custom bearings and a special cylinder wall finish. Plus, a "drag race engine" when run properly will never hit operational temps that street engines normally see.
Coated pistons reduce the absorbed heat, so in turn the pistons expand less. The quality of the aluminum is important to, as certain aluminums will expand less. Coated pistons will also allow you to tune more aggressively at lower boost levels, more power at lower boost levels, that's a good thing.
Coated pistons reduce the absorbed heat, so in turn the pistons expand less. The quality of the aluminum is important to, as certain aluminums will expand less. Coated pistons will also allow you to tune more aggressively at lower boost levels, more power at lower boost levels, that's a good thing.
Remember guys, I just do this as a hobby picking up good advice (try to) along the way, im not a mechanic or a engine builder, my car is just garage built. Im just trying to figure out whats up with their method.
I know most guys wont share a lot of this info, so im glad these guys told me what they did, however im guessing they didn't want to explain it any more in depth, so im hoping you guys can shed some light.
Thread Starter
Honda-Tech Member
Joined: Nov 2003
Posts: 3,540
Likes: 1
From: GTA Ontario.
Re: someone explain? P2W info?
yeah, i ran mine at 4 thous on weisco's and there coated, so the coating will wear off and give it a bit more room... spec on them was only 2.5 thous. However, mines a bit different application then a honda (dsm).
Anyways, so why are these guys saying their race engines are super tight? The other thing I don't get is that they say.. about race engines not seeing temps as high as street engines? Geeze, I remember reading a thread on what guys see for coolant temps at the track on 'race engines' and it was pretty high.. and I think combustion related temps would be higher as well since there making way more power? So what area could be 'cooler' as far as engine temps?
Im just looking for fact or fiction here basically, and for the facts, why facts are facts.
Anyways, so why are these guys saying their race engines are super tight? The other thing I don't get is that they say.. about race engines not seeing temps as high as street engines? Geeze, I remember reading a thread on what guys see for coolant temps at the track on 'race engines' and it was pretty high.. and I think combustion related temps would be higher as well since there making way more power? So what area could be 'cooler' as far as engine temps?
Im just looking for fact or fiction here basically, and for the facts, why facts are facts.
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