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Thread: 2 to 4 bolt, timing ?

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    Diamonds and Rust Feedback Score 1 (100%) gltasn's Avatar
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    2 to 4 bolt, timing ?

    im building a friends engine right now but we used a 4 bolt block on his 92 stealth. im at the oil pump and have read that that the crank sprocket it to be set 1 tooth off if we use the 92 crank sprocket with the sec gen block and oil pump. it also said that if we use the sec gen crank sprocket with the cas wheel that the timing would be set as normal. we are keeping the 1gen ecu and cas.

    now someone that works on these cars told me that the tooth needs set 1 tooth off no matter what. wtf? why did i have to buy the sec gen crank sprocket if i can reuse the old one? id rather use the 2 gen IF the marks wont need to be a tooth off. need to know asap so i can get this car done.

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    1st ever COTM and COTY verified Feedback Score 9 (100%) green-lantern's Avatar
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    I believe if the marks line up you are fine. I'm not positive though.

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    Forum User Not Verified Feedback Score 0 cjbyron's Avatar
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    The tooth mark on a 1G vs 2G gear are different by 1 tooth. But yes, on your 4 bolt 2G just use your 2G gear and you will be set. Line them up as usual.

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    Forum User Feedback Score 0 1stStealthN/A's Avatar
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    Did this a couple of years ago. Read ALL of this: http://www.wrenchmonkey.com/Webpages/4bolt.html

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    The CAS and ECU really have nothing to do with the timing belt. Ignition timing and cam timing are two different things. A 91-92 CAS would still work with a 93+ ECU anyway.

    [06-05, 19:29] OhioSpyderman: Brian, finding a woman is NOT the answer, you need to shop for a good VACUUM

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    You can use a 2nd gen sprocket on the 4 bolt and use the factory marks. If you use the 1st gen sprocket on the 4 bolt you have to install it one tooth off. The index marks are in different positions on the different block styles oil pumps.

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    Diamonds and Rust Feedback Score 1 (100%) gltasn's Avatar
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    thanks all thats the way i ahd it set i just have to make tripple sure cause i havent done it to MY car yet.

    i putting together a build for aksalamnder. we bored out one of my old blocks, threw in some forged pistons,spec4+ clutch,new dr650 turbos,boost,egt,wideband gauges,denso fuel pump,550 injectors,rebuilt heads,all the shit for the 2 to 4 bolt conversion, he allready has the nice fmic and stillen down pipe. waittng for a new fulcrum ball and fork so i can finish it but im 3/4 done and so far have 38 hours in the build with an extra 5.5 hours in headwork.


    right before i put the shields on.

    tried to talk him inot the ac delte but at least got him to ditch the charcoal canister and clutch vaccum tank.

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