Subject	Need some advice from the valvetrain experts here >>
Posted by	timz on April 21, 2004 at 4:12 PM
	This message has been viewed 231 times.
Message	I switched my JWT 500 cam/JUN spring to Tomei PROCAM(solid type)/Tomei springs. JWT's lift = 9.7mm (0.382") Measured. Tomei's Lift = 10.35mm (0.407"). Measured Tomei's lift is actually 10.4mm (0.409"). I measured JUN's spring solid height is 0.92" and 0.93" for the Tomei spring. Measured installed spring height is 1.370" For JWT cam/JUN spring, clearance before coil bind is 1.370"(installed height)-0.382"(lift)-0.92"(solid height) = 0.068" which is more than 0.050" minimum clearance recommended. For Tomei cam/spring, clearance before coil bind = 1.370"-0.409"-0.93" = 0.031" !!! I'm short of 20 thousand clearance. I have talked to some local race shop gurus, some said it's not ok and some said it'll be fine since most production vehicle have about 30 to 40 thousand clearance. I need more opinion if anyone can help me out on this. My machinist is going to make a set of titanium retainers for me. I need some answer so that I can tell him to copy the stock retainers or machine a +0.030" retainers to get the clearance I need. Thanks a lot!!
Follow Ups	Need some advice from the valvetrain experts here >> - timz 16:12:28 04/21/04 im not sure, but are you selling your old cams? (n/m) - NA300zx (OH) 16:17:00 04/21/04 Sorry Dave, they were sold. (n/m) - timz 16:21:33 04/21/04 This won't answer your question, but I'm trying to learn - Scotts94z32 16:55:27 04/21/04 We don't have rocker arm :)..it's direct 1:1 ratio bucket - timz 17:30:26 04/21/04 That's good info - I've learned today. I thought a 50 thou - Scotts94z32 17:55:04 04/21/04 50 thou will be way too much for the valve clearance:) - timz 18:09:43 04/21/04 isnt there a little shim under each bucket? - ScubaSteve 19:24:22 04/21/04 No shims, healthy lifters self-adjust (n/m) - Chip(GMS Racing) 21:15:29 04/21/04 Re: Need some advice from the valvetrain experts here >> - nixit 17:00:52 04/21/04 Thanks for the advice nixit:) - timz 17:38:20 04/21/04 no what he means is its better to have more clearance than - ScubaSteve 19:30:17 04/21/04 I am going almost the same route you are but - AzHeat 01:59:33 04/22/04 Your lift on the solid cams are off because you - AzHeat 02:04:11 04/22/04 No..On solid cam, cam lift = valve lift when eveything is - timz 07:25:45 04/22/04 Have you been to Tomei website ? I suggest you do because - AzHeat 08:52:17 04/22/04 You're right..I just figured this out - timz 09:39:39 04/22/04 I was thinking the same thing, how much you were - AzHeat 15:33:18 04/22/04
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