retard timing chain for turbo

[kirkallen143]

Howdy,
Since I have to get a new timing chain ( the double roller) from Mike, should I retard for the turbo? Would this limit my total degrees of advance at the dizzy? Or, just run heavier springs on the centrifical to limit the advance? One of many ? to come, thanks everyone.

Kirk ' 73 bronco

 

[Mustangaroo]

I would do the dizzy as there may come a day the turbo is off or burned up and you have to drive without the turbo, it would be alot more work to change the cam timing that adjust the dizzy or replace it with a new one for $35.00 at most parts stores?

 

[Does10s]

DEFINATELY NOT!
The advance of the distributor has nothing to do with the camshaft timing.

We have our car set up with the camshaft set at 2* adv.

The distributor is set at 17* initial and we modified it to limit total timing to a 10* sweep. So total timing will end up at 27* at around 2800rpm or so.
We're using a Duraspark dizzy.

Later,
Will

 

[kirkallen143]

Well I set the cam timing at 2* adv with the new timing chain from FSPP. I am going to run the stock cam, also. I should be all right, yes? Thanks fellers.

Kirk ' 73 bronco

ps. sense I do have the oil pan off, should I put on a new oil pump? It has given me no prob. so far.

 

[addo]

Hey Kirk, you did dial the cam, didn't you? We've had so many out of whack that it's not to be trusted.

 

[kirkallen143]

No Sir, Can I do this with the short block still in the engine bay? I have no way of taking the engine out at this time. Is this correct with the stock C9** block, "out of wack," as far as cam timing goes? What is the advantage of set the cam timing advanced, quicker down low and less top end? Thank you sir.

Kirk ' 73 bronco

 

[addo]

My understanding of advancing the cam timing slightly, is as you described; it comes "on cam" a little lower in the rev band.

If you have the radiator out, then it's probably feasible to dial the cam. Most important things to do are verify TDC, then check the cam (some grinder's websites have pretty good descriptions but you will also need the basic specs for your cam which I don't know a source for).

The final deal is to make sure it's all well-lubed and leave the shortblock at TDC compression on #1 (firing stroke). Then when you drop the head on, there's no need to turn the motor over at all for setup. Just like a bought one!

Regards, Adam.

 

[kirkallen143]

The Falcon Handbook has specs on the stock cams in degrees. Don't see why I could not put the degreeing wheel on the harmonic balancer and run your pointer from there. You do have to do this with the head on, correct? I thought so.

Kirk ' 73 bronco

 

[addo]

No, do it with the head off, balancer and timing cover off. Much easier to adjust things, plus it's the only sure way to get TDC! I don't have the FPH but sounds as though it's repaid your investment in it again.

Regards, Adam.

 

[kirkallen143]

OK I degree the cam timing last night, and check myself five times more. The results are...

Int Open: 28* btdc
Int Close: 48* abdc
Ex Open: 74* bbdc
Ex Close: 40* atdc

The stock camshaft specs are...

Int Open: 28* btdc
Int Close: 48*abdc
Ex Open: 76* bbdc
Ex Close: 18* atdc

From the looks of it, my exhaust is staying open longer than specified which is what I want for a turbo application, correct? I don't think I will advance the cam timing any, just leave it at zero. What do y'all think, thanks fellers.

Kirk ' 73 bronco