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| GRN-WGN |
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hey guys i just bought a billet crow cam so do i need one of these? if so who makes them and how much are they? its for a ed 4L
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| twr7cx |
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Crow Cams make them, depends which cam you bought weatehr you need one.
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| aaron_hogan |
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IMO no you don't *NEED* one.
The vernier cam gear allows you to advance or retard your static cam timing relative to the position of the crank. By retarding the cam you can move the effective range of the cam UP in the rev range. Similarly by advancing the cam to kick in earlier you move the power range DOWN. IIRC 2 degrees (measured at the crank) can mean a shift of up to 500rpm. One of the main reasons you would want to use a vernier gear is to correct any machining problem with a mis-aligned keyway resulting in a less than true TDC mark. Most people fit their aftermarket cams in the stock position (for typical street cars) anyway.
_________________ EA SVO Fairmont Ghia - Recaros, Bilsteins, Sunroof, SVO rims and body kit, Genie headers, DBA rotors. T5 steeda triax short shifter. 3.27 lsd. (EL 4.0 ported/polished, rebuilt and balanced, Dev5 cam. J3 chipped EL ecu, AU injectors). |
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| Timmeh |
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aaron_hogan wrote: IMO no you don't *NEED* one.
The vernier cam gear allows you to advance or retard your static cam timing relative to the position of the crank. By retarding the cam you can move the effective range of the cam UP in the rev range. Similarly by advancing the cam to kick in earlier you move the power range DOWN. IIRC 2 degrees (measured at the crank) can mean a shift of up to 500rpm. One of the main reasons you would want to use a vernier gear is to correct any machining problem with a mis-aligned keyway resulting in a less than true TDC mark. Most people fit their aftermarket cams in the stock position (for typical street cars) anyway. Thats the best description yet of what they are and how they work. Damn your good. 
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| Steady ED |
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For around $110 they are a cheap tuning tool.
But I agree with aaron and twr7cx, you don't need one. Just make sure if you get one and put it in yourself, that you tighten the bolts on it!
_________________ ED XR8 Sprint - S-Trim, V500, 249rwkw |
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| kezz |
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yeh but it sounds hell good when your rattling off modifications to the car
_________________ Kezz's 5sp Box Car ---> RPD enhanced with a bunch of other stuff |
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| GRN-WGN |
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ok yer a mechanic described it exactly the same way. he rekons crow cams are machined perfectly anyway so you wont need one unless you want it to kick in earlier- and its just another thing that can go wrong. thanks guys
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| twr7cx |
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In future, the best people to speak to to begin with would of been Crow Cams themselves, as they'd know the cam more thoroughly than anyone else. Also looking on there catalogue on there website you might be able to read what they recomend for there cams - e.g. in the case of my Valiant there was a note saying needed to replace oil pump drive gear aswell.
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| stockstandard |
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GRN-WGN wrote: ok yer a mechanic described it exactly the same way. he rekons crow cams are machined perfectly anyway so you wont need one unless you want it to kick in earlier- and its just another thing that can go wrong. thanks guys
Its not just the cam grinding that determines the angle. If the head has been machined, if different gaskets have been fitted, if the timing chain has a few k's on it, etc, etc the cam timing can move. I agree with those above though, it might well be $100 you dont need to spend. Its not hard to put in so you can put the cam in and see how it clocks up, then buy a gear if its out.
_________________ Stoke me a clipper, I'll be back for Christmas |
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| GRN-WGN |
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is there any instructions or guides anywhere on how to put my cam in? i know how to undo all the rocker gear etc its just setting the cam timing i dont know how to do?
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| twr7cx |
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GRN-WGN wrote: is there any instructions or guides anywhere on how to put my cam in? i know how to undo all the rocker gear etc its just setting the cam timing i dont know how to do?
get a workshop/repair manual for your vehicle. also have a look in the technical documents on this site. |
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| tickford_6 |
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Posts: 6449 Joined: 11th Nov 2004 |
install the cam, and check the cam cam timing with the stock gear.
If it out a few degrees get the new gear an time the cam properly. if it's within a 1 degree leave it |
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