Re: W2 heads
[Re: v8punch]
#555486
12/17/09 10:30 AM
12/17/09 10:30 AM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
I believe the only diference are will you need a longer pushrod.... valve lift will be the same.
The only real problem with the angle of the intake pushrod is that it side loads the rocker more than the exhaust pushrod with is pretty straight. My back up engine is a roller W-2 and it runs great... went 9.50 with it for a pretty low compression engine
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Re: W2 heads
[Re: patrick]
#555487
12/17/09 10:51 AM
12/17/09 10:51 AM
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Joined: Dec 2009
Posts: 242 Upland, California
Spode
enthusiast
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enthusiast
Joined: Dec 2009
Posts: 242
Upland, California
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Pushrod angles from farther back.
Im a rookie but wouldnt pushrod angles like that shown i about 15 degrees from the cam perpendicular reduce the gross lift about 25%
(cos)15=.75 +/-
Its no where near a 25% loss but it is some
umm...what calculator are you using? cos(15)=0.965925....
sorry i must have hit a wrong key you are correct BTW the calculator is a cast chinese model
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Re: W2 heads
[Re: v8punch]
#555489
12/17/09 12:40 PM
12/17/09 12:40 PM
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Joined: Feb 2009
Posts: 1,019 Finland
mafo
super stock
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super stock
Joined: Feb 2009
Posts: 1,019
Finland
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You will loose quite a bit of lift, the more offset you have the more lift you loose, I found this out the hard way...
-65 Valiant,420", all motor,2700#, dot tires, 8,42 @ 160,2
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Re: W2 heads
[Re: mafo]
#555490
12/17/09 12:49 PM
12/17/09 12:49 PM
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Joined: Dec 2009
Posts: 242 Upland, California
Spode
enthusiast
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enthusiast
Joined: Dec 2009
Posts: 242
Upland, California
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Quote:
You will loose quite a bit of lift, the more offset you have the more lift you loose, I found this out the hard way...
on a .400 lobe cam and 1.5:1 rocker the lift is .600 I figure with pushrod angle of 15 degrees the lift will be .579
.400 x .9659 = .386 x 1.5 = .579 lift at the valve
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Re: W2 heads
[Re: S/ST 3040]
#555492
12/17/09 04:32 PM
12/17/09 04:32 PM
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Joined: Feb 2009
Posts: 1,019 Finland
mafo
super stock
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super stock
Joined: Feb 2009
Posts: 1,019
Finland
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When we made our own rockers I looked into this a bit,we measured lift on both the lifter and the valve and ended up with 1.42-1 ratio with 1.7 rockers This was with 59* block and .900 offset rocker... just a thing to consider when you choose camshaft
-65 Valiant,420", all motor,2700#, dot tires, 8,42 @ 160,2
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Re: W2 heads
[Re: mafo]
#555493
12/18/09 01:57 PM
12/18/09 01:57 PM
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Joined: Aug 2004
Posts: 2,128 sweden
sshemi
top fuel
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top fuel
Joined: Aug 2004
Posts: 2,128
sweden
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Quote:
When we made our own rockers I looked into this a bit,we measured lift on both the lifter and the valve and ended up with 1.42-1 ratio with 1.7 rockers This was with 59* block and .900 offset rocker... just a thing to consider when you choose camshaft
My w5 motor was spot on the camcard lift with Harland sharp rockers. Exactly 0.643 on intake. dont know if Hs take the angle of the pushrods in calcs when making their rockers, but they are equal in lengths with the ex rockers so idont think so.
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Re: W2 heads
[Re: sshemi]
#555494
12/18/09 04:31 PM
12/18/09 04:31 PM
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Joined: Feb 2009
Posts: 1,019 Finland
mafo
super stock
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super stock
Joined: Feb 2009
Posts: 1,019
Finland
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I think my example was on the extreme side, we had to use a lot of offset on those Swedish made heads
-65 Valiant,420", all motor,2700#, dot tires, 8,42 @ 160,2
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