Cam Regrinds

[Shadow24]

Shayne,

my 24v is SOHC, same # of cams, just an extra 6 lobes compared to the 12v

[c2xejk]

as for offset cam lsa's the subject is kinda not spoken about much but is widely used in sohc and dohc v6's that dont use a variable cam timing system, but with a small displacement v6 like a 3.0l if you made cams that match front and rear then you do narrow the powerband to the type of grind you use in the motor, even when you cam a big nasty v8 you wind up moving around the powerband with cam change, but with them the torque loss from a hot cam isnt felt as badly because of the virtue of already being a much larger motor to begin with. the 3l's have a broad powerband stock because of the different cam lsa, and they only fall off on the top end because of lack of cam duration and intake tract that needs at least some basic clean up and porting to make flow well.

I can afford to give up some low-rpm torque to gain higher-rpm power...

On a side note, I advanced the cams 4 degrees and did some testing last night. Indeed low-RPM power is UP. Mainly seems to be up below ~2500 RPM. Looking at the log file, you can see the rate of increase of RPM definitively fall off at higher RPM... Cruising at 55mph and the throttle was reading ~1%. I had to turn off the closed loop IAC because it was trying to mess with engine speed as I was cruising!

When I retarded the cams 4 degrees I picked up power above ~5500 RPM...

I might try making some 2 degree sprockets some time.

[Sundance 6g72]

1% throttle at 55 is what you get with twin 80s :P

[RoadWarrior222]

Lack of torque low down = traction control

One can find 2* offset keys I would think..... Or I'm kinda tempted to hog out the key slot each way and shim it.

[c2xejk]

1% throttle at 55 is what you get with twin 80s :P

It wasn't as bad with the cams retarded 4 degrees...

Lack of torque low down = traction control

You got it...

One can find 2* offset keys I would think..... Or I'm kinda tempted to hog out the key slot each way and shim it.

The 3L use a pin to locate the cams. What I did was file the hole oval, then tack weld the opposite side to adjust them.

[Mdoe8]

Just send two of the higher LSA cams (same bank) in to get a regrind. That way they match.

[Sundance 6g72]

we thought about that but it wont work. one drives the dizzy

if you deleted the dizzy and ran coil on plug or something it still dosnt work because the cams are different the way they fit in. sad face

[Mdoe8]

OHHHH good point. Forgot about that. (sad trombone sound)

Are all of the 12v cams the same offset? I know the diamante are supposed to be a tad more aggressive, do they still have the offset LSA?

[Shadow24]

don't forget that the cams are different lengths in order for the timing belt to line up correctly (staggered pistons/heads) in addition to the 12v having the front cam drive the dizzy

[RoadWarrior222]

Are it possible to run two front or two back heads, never looked at it.

[MC#4]

The bare heads are identical, you can flip them and use em on either side.

[Sundance 6g72]

problem is that they are "flipped" to fit, so no go

[Ondonti]

Vee motor guys. Rear bank is closer to the belt then the front head. The distributor adapter housing is what extends the head all the way to the belt. As stated, heads are identical.

[nordic2068452]

Have you heard these cams hybrid ?