heys guys. So I am going to be running new valves, guides, springs, retainers and cams. I am wondering if the valve clearance specs of 0.45mm on the stock head would still apply to an aftermarket setup such as this. I am unsure if I am going to use a "drop-in" cam (Poncam type a/b, etc) or something with a lift over 10mm, but would this affect the specs? Just trying to figure this all out.... and to source the shims
Thanks for any help.
“Hey, come on, its a car right? No. It’s a symbol of your history, its a thread of continuity from which you came to where you are. It’s important that you don’t want to forget who you are.” -Dr.Phil in "Love the Beast"
I was actually just about to post this same thread because I'm in the same boat. I'm running stainless valves now and they expand at a different rate than stock.
IMO the stock clearances are real, real loose and I'm not sure why. Bike heads set up the same way run 1/4 of the clearance compared to the GTR head. There must be a reason but I don't know what it is.
I planned on baking my valves and measuring them and comparing to the stock expansion rates. I'll post back here with what I find.
1992 GTR
1988 Mazda RX-7 10AE
1999 F250 Superduty 7.3L Turbo (tow vehicle)
sounds good man. If anyone could shed some more light on this that would be great.
“Hey, come on, its a car right? No. It’s a symbol of your history, its a thread of continuity from which you came to where you are. It’s important that you don’t want to forget who you are.” -Dr.Phil in "Love the Beast"
Anyone got any ideas?
“Hey, come on, its a car right? No. It’s a symbol of your history, its a thread of continuity from which you came to where you are. It’s important that you don’t want to forget who you are.” -Dr.Phil in "Love the Beast"
use oem specs..... the tomei genesis we got in with a full built head oversize valves and the whole 9 still run .38mm and .45mm just like stock
cheers
Last edited by GTS4-R; 09-12-2011 at 12:45 AM.
GTS4-R
How's your head sound? Noisy or quiet?
I did extensive googling and find that many people just run stock clearances, though tomei apparently lists (this is 2nd hand knowledge, I didn't read it myself) 12 and 15 thou for their camshafts.
1992 GTR
1988 Mazda RX-7 10AE
1999 F250 Superduty 7.3L Turbo (tow vehicle)
in or mm? .015in is .38mm
GTS4-R
good enough for me, Thanks guys.
“Hey, come on, its a car right? No. It’s a symbol of your history, its a thread of continuity from which you came to where you are. It’s important that you don’t want to forget who you are.” -Dr.Phil in "Love the Beast"
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