H22A Forged Piston DYNO RESULTS update 8-17-07
 

Ok this is asking bigdaddyvtec a qustion since he has the most experience with H22's. Did you have knock when you first started your car? Was your head/block milled any and did it throw off your cam timing? I have my H22A turbo Holset H1C Eg hatch scheduled to go on the dyno this friday. A friend thats not so local swung by to check out the finished good and he also has a forged piston set up but its in a 3000gt vr4. So I started up the car with the lap top connected and I know that you have piston slap when first turning over but he noticed on the S300 that I was still holding 5V's of knock after the radiator fan even kicked on. The car runs ok and when I drive it for a bit the knock goes away and when I pull in the garage its still not present till about 5 min later then it comes back. So is it slap or something else. I check the valve lash after it cooled for 5 hrs and still .07 on the intake and .08 on the exhaust. I Checked between the rocker arm and the tappet on the of the valve/retainer area. Is this right?
PLEASE SOMEONE THAT KNOWS H22A's HELP

Re: H22A Forged Piston=knock? BIGDADDYVTEC HELP
 

Did you put forged pistons in an unsleeved H22 block?

Re: H22A Forged Piston=knock? BIGDADDYVTEC HELP
 

he probably did and the FRM sleeves are not happy about it.

Re: H22A Forged Piston=knock? BIGDADDYVTEC HELP
 

He claims to have a sleeved block. Perhaps too much piston/wall clearance?

Re: H22A Forged Piston=knock? BIGDADDYVTEC HELP
 

Knock that comes and goes? :/

What are the difference in the coolant temps logged via the S300 when it is and when it isn't knocking? Also, what are the oil pressures?

Re: H22A Forged Piston=knock? BIGDADDYVTEC HELP
 

For you dumb asses that cant read from the past it's a forged Ross 88mm 9:1comp piston with L.A. ductile iron 93mm sleeves outer diameter. But back to a great question. J.D. the coolant temps read from first start up at around 100* "summer time" and when it's warmed up and crusing it's registering around the 170* - 195* mark. When it reached the +165* mark it goes away and anything less than that the knock comes back. The gap of the rings is set up by Ross specs. My friend has J.E. and his pings for about 3min after start up and goes away but mine seems to last longer than that. Oil pressure reads normal around 60-80, it's got the prodrive oil pump gear and is also shimmed to increase oil pressure

Re: H22A Forged Piston=knock? BIGDADDYVTEC HELP
 

interesting. Any chance you can get some sound up here?

Re: H22A Forged Piston=knock? BIGDADDYVTEC HELP
 

Nah I have a hard enough time trying to get pics up but you can go to here ====> http://videos.streetfire.net/video/b...7c005c44cb.htm see no knock because I just drove it for about 5min but then if you let it cool and just run sitting still for a but it gets knock again.

Re: H22A Forged Piston=knock? BIGDADDYVTEC HELP
 

60 psi at idle? Wowzers.

Re: H22A Forged Piston=knock? BIGDADDYVTEC HELP
 

No No No crap I mis worded it. Its around 60 to 80 at WOT after the VTAK is enabled after 5600rpm. Sorry about that J.D.