duplex swiftune cam timing
Turbo Mini Forums

Hi,
I'm trying to time my camshaft. I have a swiftune duplex kit with 7 keyways in the small sprocket wheel. Can anyone tell me how this practically works. With dot to dot it is about 112 degrees. My camshaft should be 108 degrees. At the moment it's way to cold for trial and error, there should be a logical solution :)
Thanks!
Remko
Supercharged Van
Turbo'd (soon) Pickup

What cam should be 108?
Trial and error is the way with these

I seriously doubt it!

irrc sw5-07 was 106-108, i think mine eneded up being timed in at 107!

Its a piper turbo phase II. Recording to Avonbar it should be timed at 108.

I think I've got the instructions for this at home. Let me see this weekend.

Edited by Vegard on 8th Feb, 2012.

That's exactly the duplex kit I have!

I think did some math.
small sprocket wheel; 20 teeth, 18 degrees per tooth
aproximately 40 degrees between the keyways.
Example. Mounted center keyway and dot to dot. Timing 110 degrees.
1 keyway CCW: timing 110 - 40 = 70 degrees
2 teeth CW: timing 70 + 2x18 = 106 degrees.

If this math is right i'm able to set the timing from the center keyway and dot-to-dot 4,6,8,10,12,14 degrees positive and 4,6,8,10,12 degrees negative. But going from 110 to 108 degrees doesn't seem to work....

Am I doing the math right?

@ Vegard: I would like to see what's in your instructions!

Get it as close as then use an offset key

I seriously doubt it!

Should you not be considering stretch too?

In the 13's at last!.. Just

Paul, you know this as good as anyone. The reason for buying such a timing kit is to not use an offset keyway.

Paul, you know this as good as anyone. The reason for buying such a timing kit is to not use an offset keyway.

Im pretty sure Swifty himself told me that

Edited by paul wiginton on 9th Feb, 2012.

I seriously doubt it!

Why are you doing any maths ?

You dont install the cam based on maths alone. You install it based on actual measurements relative to TDC and cam lift.

Not from maths on where you think it should be. Even more important with adjustable gear.

Edited by stevieturbo on 9th Feb, 2012.

9.85 @ 145mph
202mph standing mile
speed didn't kill me, but taxation probably will

Of course I will do actual measurements!I'm doing maths because it's way to cold to try all possible positions of the chain and the keyway.
So set it up dot-to-dot --> measure --> calculate + adjust --> measure -->OK!

At last...

I hope this makes sense to you.

Edited by Vegard on 26th Feb, 2012.