I've got the head milled because it was warped. The guy at the machine shop said it was milled about "8 thou" I'm assuming its 8 thousandth of an inch.
How would I go about adjusting the timming while putting back the timming belt.
#81007, "RE: Milled Head: Question about Timming." In response to Reply # 0
.008 or 8 thousands of an inch is so small your timing won't change significanly but to answer your question, it retards the camshafts since the distance between the crank gear and the cam gear is shortened. To compensate you would advance your camshaft about .25 of a degree ( less then 1 degree on your cam gears).
#81009, "RE: Milled Head: Question about Timming." In response to Reply # 1
I had .008 taken off of my head, and it made for around a half tooth off on the cam gear timing marks, which equals approx 4-5 cam degrees. To effectively put the timing back to stock, you will need adjustable cam gears. Now I ran my setup half tooth off and it ran fine, but it was the intake cam that was mostly off, and the exhaust cam mark seemed to stay pretty close to stock. 8thousandths doesn't sound like much, but it will throw off the cam timing just a little..It just makes it a PITA to line up the timing marks when putting on the gears, since that half tooth just messes the whole procedure up..
13.5 @108 MPH-2.2 60ft(stupid FWD!) S16G @ 18 PSI/FMIC/Running on MegaSquirt II (Now with sequential fuel injection) My webpage: http://eclipsed4evr.home.comcast.net -1998 Mitsubishi Eclipse RS-T- "Toy" -1992 Plymouth Laser Turbo AWD(SOLD) -2000 Honda CR-V(daily)
#81012, "RE: Milled Head: Question about Timming." In response to Reply # 1
Originally posted by Edisondaman To compensate you would advance your camshaft about .25 of a degree ( less then 1 degree on your cam gears).
Simplified: Your would adjust your cam gears to a degree much smaller than you can acurately gauge. Leave it alone, you won't have any problem.
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#81014, "RE: Milled Head: Question about Timming." In response to Reply # 4
Yep, what Dino said. Look at at this way, a single strand of human hair is approx .006 of an inch, it would really hard to compensate that small an amount, not impossible but not worth the hassle to set it up to read accurately.
#81015, "RE: Milled Head: Question about Timming." In response to Reply # 5
Originally posted by Edisondaman Yep, what Dino said. Look at at this way, a single strand of human hair is approx .006 of an inch, it would really hard to compensate that small an amount, not impossible but not worth the hassle to set it up to read accurately.
Hey Eddy, would you mind explaining how you calculated this based on the amount of metal removed, for the benefit of the rest of us? I'm pretty curious myself, and it'd e a big help for people in the future.
______________________________ If a sentence found online has 35% misspellings or greater and includes at least two racially charged expletives, chances are it is a YouTube comment.
'95 Eclipse TurboGS (garage deco) '95 TSi AWD (restoring a survivor) '97 Talon ESi-T (poor impulse control) '99 Eclipse RS-T (daily beater) '13 Evo X (mostly stock) '17 Sienna (Middle Aged Dad Mobile)
#81038, "RE: Milled Head: Question about Timming." In response to Reply # 6
Originally posted by XtremeRS Since you had your head surfaced, depending on how much has been taken off in total, you could be 1/4-1/2 tooth off. When you set your timing, keep the crank at TDC ecactly, and if your cam marks dont line up perfect, get it so the marks are slightly above cam bolt centerline. When i had it set to below centerline, it had bad vac and ilded poorly, but set it for above centerline, and its great. Just try and keep the exhaust cam mark closest to centerline, and if you can, keep the intake mark slightly above centerline(intake slightly retarded).
Well I did XtremeRS's suggestion to the "T" when I just re-assembled the motor, waiting on a few fuel fittings before I start it up and see if the timing is correct. *crosses fingers*
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