higher ratio rocker arms in turbo application

[flamingchicken]

Re: higher ratio rocker arms in turbo application

Running a cam only is fine for stock heads, its when you want to run more lift adding 1.9 rockers is where your going to need the guides cut. If you have a stock cam then 1.9 rockers is fine.

See his cam plus 1.9 rockers dont even put him over a half inch of lift.

[thebeewantsboost]

Re: higher ratio rocker arms in turbo application

we can't possibly be talking about the valve guides. that doesn't make any sense at all... it must be the "pedestal". and btw i would go with 1.9's across the board. its just that i found a good deal on these. i did contact zzp, and i'm going to take a picture of them, and they should be able to tell me what size the smaller is.

[thebeewantsboost]

Re: higher ratio rocker arms in turbo application

ssms is running the cam and 1.7's i believe.
i've never dug into a 3.8, but these are the rockers and pedestals i got with the rockers springs and push rods.

[ssms5411]

Re: higher ratio rocker arms in turbo application

See his cam plus 1.9 rockers dont even put him over a half inch of lift.

Stock heads are maxed at something like .530 lift, I had mine cut to a .600 lift.

[techsan23]

Re: higher ratio rocker arms in turbo application

we can't possibly be talking about the valve guides. that doesn't make any sense at all....

It's the valve guides. Did those rockers come with taco sauce? Sweet!

[flamingchicken]

Re: higher ratio rocker arms in turbo application

Stock heads are maxed at something like .530 lift, I had mine cut to a .600 lift.

.485/.490 with 1.9 rockers.

Those are the numbers he posted, and if correct, then he should be okay without cutting the guides.

Unless there is something I am missing.

[thebeewantsboost]

Re: higher ratio rocker arms in turbo application

i dont think anybody ever said that i would need them cut, not sure how we got off on this topic. i sent a pic of them to zzp and the guy i spoke with seemed to think they were. 1.8 and 1.85. but said it was a such a long time ago that he doesn't remember.

they came with arbys sauce also

[thebeewantsboost]

Re: higher ratio rocker arms in turbo application

for the sake of learning does anybody have pictures of valve guides that were cut to accommodate higher lift? i'm having issues understanding how that would work. where does the valve spring go?

[thebeewantsboost]

Re: higher ratio rocker arms in turbo application

OOoohhh this whole time i've been thinking that the cutting was because the push rod.was going to be to close to it or something... which obviously doesn't make sense... the valve guide are cut so that the spring will actually sit lower. and theres more room for more lift. right?

[thebeewantsboost]

Re: higher ratio rocker arms in turbo application

at 1.8 and 1.85 these are the lift numbers.

.464
.477
dunno if i should just wait and get 1.9's or try these out. i've been lookin at turbo cams. and some have the same intake and exhaust lift some favor the intake and some favor the exhaust. kinda shocking to me that they favor the intake. unless the duration is different or something. i definitely have alot to learn when it comes to cams.

[bigbrian442]

Re: higher ratio rocker arms in turbo application

OOoohhh this whole time i've been thinking that the cutting was because the push rod.was going to be to close to it or something... which obviously doesn't make sense... the valve guide are cut so that the spring will actually sit lower. and theres more room for more lift. right?

The valve guides are cut so the keeper and retainer do not hit the guide when using a high lift cam.

[thebeewantsboost]

Re: higher ratio rocker arms in turbo application

ooooh so literally just the guide. i thought the part of the head where the spring or retainer sits on, was cut also. good to know.

[thebeewantsboost]

Re: higher ratio rocker arms in turbo application

intiresting read
http://www.camaroz28.com/forums/forc...e-help-333673/
"The theory behind reverse-split turbo cams is this: If, as with most turbo systems, exhaust pressure is 2 X boost pressure, then the exhaust is also around 3 X more dense than a NA engine. More dense means it needs less time (duration) to escape the cylinder."

[thebeewantsboost]

Re: higher ratio rocker arms in turbo application

http://www.hotrod.com/pitstop/hrdp_1...s/viewall.html after reading this i decided that the higher ratio rockers aren't right for me setup so i will be selling them.
1.85/1.8 with modified pedestals, pushrods and bolts etc