turbo valvetrain?
12-12-2006, 11:09 AM
#21
3.0 BAR
Join Date: Mar 2006
Posts: 5,631
Re: turbo valvetrain?
Originally Posted by turbohf
run it till it breaks?
local guy built his turbo motor, used the head off his old NA motor or someshit that had seen revs in the 9k range with no problems... but with 20psi of boost and stock revlimit it ended up dropping a valve and nukin the hold motor...
here is something to think about: with a boosted motor there is X about of boost pressure pushing down on the head of that valve now that wasnt there with an NA application. so thats ~20psi of spring pressure that needs to be made up for. if its not then you could float the valves at a lower engine speed, bending valves, breaking them, and droppin them onto the pistons...
you can pick up a set of nice springs/retainers for like 225-300bucks. they will work fine with stock or aftermarket cams... or you can drop a valve on a B18C and be out several thousand dollars...your call...
local guy built his turbo motor, used the head off his old NA motor or someshit that had seen revs in the 9k range with no problems... but with 20psi of boost and stock revlimit it ended up dropping a valve and nukin the hold motor...
here is something to think about: with a boosted motor there is X about of boost pressure pushing down on the head of that valve now that wasnt there with an NA application. so thats ~20psi of spring pressure that needs to be made up for. if its not then you could float the valves at a lower engine speed, bending valves, breaking them, and droppin them onto the pistons...
you can pick up a set of nice springs/retainers for like 225-300bucks. they will work fine with stock or aftermarket cams... or you can drop a valve on a B18C and be out several thousand dollars...your call...
12-12-2006, 12:34 PM
#22
0.0 BAR
Join Date: Feb 2003
Posts: 0
Re: turbo valvetrain?
Trav-*** dropped a valve on his 2.0/VTEC, and he had springs/retainers. He also have Ferrea exhaust valves. And stock intake valves. Both intake faces dropped right off the stem on #2, toasted the head and holed the piston, didn't so much as scratch the bore. Craziest thing I've ever seen.
The Ferrea exhaust valve facess were slightly bent by the experience, but their stems were were true and the Ferrea retainers kept the intake stems from flying all over the place. With the valvecover off, spinning the engine, you'd think everything was fine. None of it bound up or the like.
The Ferrea exhaust valve facess were slightly bent by the experience, but their stems were were true and the Ferrea retainers kept the intake stems from flying all over the place. With the valvecover off, spinning the engine, you'd think everything was fine. None of it bound up or the like.
12-12-2006, 04:16 PM
#24
1.0 BAR
Join Date: Dec 2006
Posts: 315
Re: turbo valvetrain?
Originally Posted by ososlohatch
lol coming from a guy named toda ..haha
and those ebay knock offs are also $1200, although you don't care.
keep to the tech, don't turn HMT into H-T.
12-12-2006, 04:54 PM
#25
1.0 BAR
Thread Starter
Join Date: Mar 2006
Posts: 266
Re: turbo valvetrain?
alright so im still new to this valvetrain stuff but what ive got so far is that i can run around 85lb/in springs in my head for a red line good to around 9k with my stock gsr cams? i know the rev limit will be set as to where it will make power but assuming im running enough boost pressure with my 60/63 turbo and its still making power this will be good? also whats the difference in retainers what purpose do they serve (raise spring rates?) and could i just run new springs with stock retainers on a turbo setup stock cams and be able to potentially rev that high?
12-12-2006, 05:40 PM
#26
0.0 BAR
Join Date: Nov 2006
Posts: 0
Re: turbo valvetrain?
I really wish that Intrinsic would move their expertise into the B-series, even though the dinosaurs are on the verge of extinction. They had this huge description of how harmonics in the cam shaft cause irregular vibrations at higher RPM and how cryotreating the cams prevents these all the way to a 20k rpm rev range or something. That ---- is cool, because then we wouldnt have 85in/lbs wearing the cam lobe so crazy + super revvyness on a boosted motor. One thing to invest in is a set of quality keepers, I've had more friends drop valves due to broken keepers than floated springs, well those are the dual spring VW 16v motors though...
12-12-2006, 05:47 PM
#27
3.0 BAR
Join Date: Mar 2006
Posts: 5,631
Re: turbo valvetrain?
Originally Posted by T0DA
Name isn't neccissarily related to the company.
and those ebay knock offs are also $1200, although you don't care.
keep to the tech, don't turn HMT into H-T.
and those ebay knock offs are also $1200, although you don't care.
keep to the tech, don't turn HMT into H-T.
wheres your ------- ****...Hey... I got an idea:
Go ---- yourself...all the way back to hondah tech...******
12-12-2006, 09:28 PM
#28
0.0 BAR
Join Date: Feb 2003
Posts: 0
Re: turbo valvetrain?
Originally Posted by wafflesincars
I really wish that Intrinsic would move their expertise into the B-series, even though the dinosaurs are on the verge of extinction. They had this huge description of how harmonics in the cam shaft cause irregular vibrations at higher RPM and how cryotreating the cams prevents these all the way to a 20k rpm rev range or something. That ---- is cool, because then we wouldnt have 85in/lbs wearing the cam lobe so crazy + super revvyness on a boosted motor. One thing to invest in is a set of quality keepers, I've had more friends drop valves due to broken keepers than floated springs, well those are the dual spring VW 16v motors though...
Everyone running off the shelf oil on high pressure aftermarket springs, or unusually high lift cams, have been experiencing camshaft failure since all the high pressure lubricants have been removed for environmental reasons. Mike94se of all people, IIRC, has an account on bobtheoilguy's site to check up on the periodic oil assays as the petroleum guys have been playing games with blends for a hot minute now.
Back to the crankshaft harmonics dealio... I was under the impression all the top name engine builders agreed that stock B-series cranks were balanced to 10K from the factory. Just food for thought.
Originally Posted by bigdaddyvtec
---- YOU YOU ------... who the ---- are you wheres your ------- ****...
Hey... I got an idea:
Go ---- yourself...all the way back to hondah tech...******
wheres your ------- ****...Hey... I got an idea:
Go ---- yourself...all the way back to hondah tech...******
