I am trying to use Dynamic CR calculations to figure out the right CR for my N/A motor build and I can't find the closing timing angle(point) for a W41 intake cam. I'll even take the HO spec if anyone has that, it could be the same but if not it should be close enough.
PSN ID: Phatchance249
ive tried... to no avail... no info
Put them in the head and literally measure it with a degree wheel. Its the only way you'll get it and its a perfectly legitimate method.
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OR... send them off to like deltacams.com and have them measure it...
How much does that cost? With a degree wheel and the cam in the head with a valve in it you should be able to get an acurite enough measurement for your purposes.
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2002 Chevy Cavalier LS Sport Coupe: In a Junk Yard
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If you've ever worked on a quad 4, you would understand how difficult it is to measure. The only way to do this would require permanently modifying the cam towers to fit a dial indicator. I have had plans of doing this for a long time to compare my LO and HO cams, but have been caught up in too many other projects.
I have no signiture
Huh? no put a cheap plastic degree wheel around the cam and wait for valve to close.Real easy, only need to be within 5 or 10 degrees for this math. Its been a while, tolerances may be even less. Though I'm only half paying attention at this point. I'm trying to take a random @!#$ty tune done in injector pulse width and change it over to VE on a car running WAY too big injectors and very low fuel pressure so it idles right. Total @!#$ show, and I have a monster excel file to do all this math.
1994 Saturn SL2 Home Coming Edition: backup car
2002 Chevy Cavalier LS Sport Coupe: In a Junk Yard
1995 Mazda Miata R-package Class=STR
Sponsored by:
Kronos Performance
WPI Class of '12 Mechanical Engineering
WPI SAE Risk and Sustainability Management Officer
This isnt a pushrod engine. On a Q4 you can not tell when the valve is completely closed. You have to modify the cam housing and use a dial indicator.
It's not because the engine is an ohc that makes it difficult to measure. The problem is that there is no "valve cover" like an ecotec or ln2 has. The quad 4's cam tower IS the valve cover, which is also what holds the cams in place. Therefore, the cam tower must be modified in order to measure valve events.
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You cant watch the valve with the head upside down and look at the combustion chamber side of the valve?
1994 Saturn SL2 Home Coming Edition: backup car
2002 Chevy Cavalier LS Sport Coupe: In a Junk Yard
1995 Mazda Miata R-package Class=STR
Sponsored by:
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WPI SAE Risk and Sustainability Management Officer
Why cant we just fab up some sort of cap to bolt down over the two ends of the cams. Wouldnt this be a cheap and easy rout? Or is it somthing that would be two difficult to try? Just asking.
The cam needs to be able to spin. Cutting a cam housing up will properly support the cam and with some lube will allow it to properly rotate. Personally I would prefer to have some more support on the cam than just the end caps, but that setup should be okay.
Brad you been in contact with Delta cams about this? They are only 90 min from me so shipping would be minimal. I might just drive it, give me an excuse to see my nephews who are another hour north.
PSN ID: Phatchance249
I was thinking caps like a main cap type. If somone one could make caps like that for the cam so itt would be easier to do this.
The problem with cam carrier "caps" on a quad 4, is that there would be no way to seal the tower. If you just wanted to use them when measuring the valve lift, that's fine, but it would be equally effective as cutting up a spare cam tower and much cheaper.
What I had planned to do was drill a hole in each cam tower cap and weld a threaded bung to it. This way, you can place the dial indicator in there when you go to measure the valve events. When I'm done, I can just screw in a plug to seal it back up. That way, I wouldn't need to rip the timing apart any time I feel like measuring. This would also be useful for those with adjustable cam gears.
I have no signiture
I thought cavafan1 already timed the w41 cams...am i wrong? i saw where he listed all the opening / closing points......am i the only one that read it??
I heard something about someone getting the specs on them.
1994 Saturn SL2 Home Coming Edition: backup car
2002 Chevy Cavalier LS Sport Coupe: In a Junk Yard
1995 Mazda Miata R-package Class=STR
Sponsored by:
Kronos Performance
WPI Class of '12 Mechanical Engineering
WPI SAE Risk and Sustainability Management Officer
SO I get about 232* for intake closing completely or 214* for intake to close down to only 0.050" lift.
1994 Saturn SL2 Home Coming Edition: backup car
2002 Chevy Cavalier LS Sport Coupe: In a Junk Yard
1995 Mazda Miata R-package Class=STR
Sponsored by:
Kronos Performance
WPI Class of '12 Mechanical Engineering
WPI SAE Risk and Sustainability Management Officer
too slow ho :p i already posted it hahaha
i posted it because you FAILED to post it.
i posted it...maybe you just FAIL at clicking a link :p haha
