Cam timing effects on compression

[datzenmike]

If 61 degrees should give a cranking compression of 215, and knowing that increasing the closing degree lowers the compression, I assumed that maybe you are advanced one tooth (or 9 degrees). I was hoping that 70 degrees would drop it to 160psi and that would prove to be your problem.... Oh well.

What about retarding the cam a tooth and trying it? Cheap and easy to do. If it improves, maybe try another tooth until power drops off. Then fine tune it closer by advancing/retarding one 4 degree hole on the sprocket. Each hole is almost 1/2 a sprocket tooth.

You expect 160hp? So you are down about 50%... nothing to loose by trying.

[defdes]

Well....all back to good. The timing mark plate was knocked and what I assumed was TDC was not, straightened that out, then changed the cam timing. Now 215 compression on all cylinders.

[datzenmike]

Woot!

[510rob]

glad to hear you got it sorted out. can't wait to hear new dyno numbers.

[TUF510]

Good to hear it was something simple. It would be good to see and hear some footage of it at full song next time its on the Dyno or at a race track.

Peter

[James]

Glad to hear you had an easy fix. I love those - especially when you can find them (and haven't already spent a bunch of effort chasing down the wrong stuff.)

[defdes]

(and haven't already spent a bunch of effort chasing down the wrong stuff.)

I did really, but it was multi faceted problem as it turned out. My distributor needed to be recurved for the new motor too, which added to the confusion.

[icehouse]

So when are you going to re Dyno your car so we can really know what that L16 puts down?

[vgwagon]

If 61 degrees should give a cranking compression of 215, and knowing that increasing the closing degree lowers the compression, I assumed that maybe you are advanced one tooth (or 9 degrees). I was hoping that 70 degrees would drop it to 160psi and that would prove to be your problem.... Oh well.

What about retarding the cam a tooth and trying it? Cheap and easy to do. If it improves, maybe try another tooth until power drops off. Then fine tune it closer by retarding one 4 degree hole on the sprocket. Each hole is almost 1/2 a sprocket tooth.

You expect 160hp? So you are down about 50%... nothing to loose by trying.

That is impressive to make that call over the internet. You are the "L" master zen.

[defdes]

So when are you going to re Dyno your car so we can really know what that L16 puts down?

This week...if my "ship comes in". I blew $190 last week on figuring the problem.

[510rob]

time for predictions...

I say 165HP

[icehouse]

time for predictions...

I say 165HP

I'm guessing 148 WHP

[510rob]

time for predictions...

I say 165HP

I'm guessing 148 WHP

Alright, I should be more specific. 165BHP, at the 'brake', on an engine dyno, calibrated to S.T.P. conditions, operated by a credible and knowledgeable person, all overseen by at least three dependable and reliable witnesses, with one witness tasked with fair and frequent distribution of ice cold beers...

[icehouse]

time for predictions...

I say 165HP

I'm guessing 148 WHP

Alright, I should be more specific. 165BHP, at the 'brake', on an engine dyno, calibrated to S.T.P. conditions, operated by a credible and knowledgeable person, all overseen by at least three dependable and reliable witnesses, with one witness tasked with fair and frequent distribution of ice cold beers...

I thought you were going to say it had to be on a Rebello dyno haha

[bertvorgon]

I'm going to say 145.