britz1

OK guys I am going to revive this thread... i have had a google and i cant find the info i need... I have built a few RB engines now and all have had CP pistons... All have heavy blow by and i have tried tightening the ring gaps head drains and different machine shops ect... they all do not breathe and oil out on the street but as soon as i use them in a drift application... 1-2 min of flatout 4th gear limmiter ect they chuck out 1 to 2 litres of oil into the catch can... i dont want to know how to controll the blow by as i have tried it all... it is just too much i want to know who has used what brand of piston for a drift application and what works... because CP is Junk and is never going in any of my motors again... PS i dont want to know about your mates street driven 900hp rb26... its just not the same as a drift car...

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yer its a drift car so all it sees is mashed pedal... it may be my catch can design... its my own Next step is to install a rear head equalizer and sump vents soo motor out for the 3rd time...

i have spent ages reading this thread... i was just looking to see just howmuch is to much blowby i have a forged stagea rb25 botom end with a rb26 head... making 600hp atw with e85 i have had problems with my machining and the cylinder to bore clearance is too big... near 5 tho.... long story but yer the rings arent sealing properly and im getting blowby oil system is hks rwd sump 10L, Jun oil pump, Jun Drive Collar,mines cam cover baffles, drilled oil returns and 1.2mm tomei restrictor in head and the other 2 blocked off -12 breathers to 5L catch can with foam baffeling and a VDO scavenge pump off the catch can. I recently tryed fitting a -10 line from the VCT drain bung to the catch can to try and vent some of the crank case pressure but it did not help.. I only have one small kn filter on the catch can (-12 size) could this not be helping... should i have more breathers..

hay mate im just new to welding tig aswell ... i have had a lot of help from boiler makers... the most important thing with tig is that the tungsten tip is sharp...

hmmm well my car has a cold air unduction pipe and a 12L jun sump maby its the big sump that did the goods... took longer to heat up the oil.... oh and btw i was at adgp in my R33 and it was overheating during prac... but it runs BP98 and adgp was stupid hot this year and prity hard on the cars

Mate i just had a brain fart...... we have been drifting 500hp s1x Rb power cars for years here in WA and we have sorted the cooling problems... you neeeeeeeed to f**k off those thermo fans they just dont work... then use the old nidssan clutch fan and shroud, koyo rad and oil cooler (lots of guys put them in the corners but there gay and hit shit sooo i have a put mine inbetween the rad and FMIC and i cant get my oil temp over 90deg)... and the biggest thing is fuel... we run e42 (E85 mixed 1/2 with BP98) Jewmix but E85 is even better. oh and btw we had a guy do the rear radiator setup on a s13... it never worked just overheated constantly... he gave up and did what we where all doin

would assume 4in dude... my gt35 is 4in with a taper to the comp wheel so bigger turbos less taper me thinks

Ok guys sorry it took so long but its assembled....... there was a major problem i was havving.... my cheap dial bore guage was bot completely tight on the chast so as i spon it around in the bores it became ever so loose... after i noticed it i locktighted and then mesured again.... it was within specs i did bolt the head on with the old gasket and torqued it down mesured the bores and they where even closer..... so in reply the torque plate makes f**k all diference for mesurment and ring gap purposes but i would say it is needed for boring(due to extra forces it produces)

we ran alot of drift cars on e42 (E85 100l mixed with 100l or BP98) just use a 200l drum... it worked well all last year, i have a 600hp built rb26 we went from pump fuel with 850cc injectors and 25+psi to 1100cc injectors on e42 with 550hp and 18psi...

Cps manual states the bore max out of round is 0.0002" (0.005mm) ... i have mesured 0.03mm out of round witch is a fair bit out number wise but not phisically far at all ... i will bolt the head on tomoz with the old head gasket on and check it from the bottom

sorry dude there 20 thou over so 86.5mm pistons all machined as per CPs Spec there custom dome pistons for higher compression as i am running a rb26 head with some combustion chainber work, i was also planing on doin the old plastesine trick to confirm the pistons dont fowl on the head, even thow my mesurments say there fine.

Thanks bro that is the sort of info i was chasing.... i dont think it is my bore guage as it is consistant and the method i am using to mesure is correct... just no torque plate.... i will stick the head on torque it down n have a mesure..... for reference it was 0.02mm out of round with no plate with the wider side consistantly in ln line with the other cylinders.