Hi!

As i said i have an DB-66 iskendrian regrind camshaft, i read in this paper that im enclosing:
valve lash 0.020 = 0508mm is the measure that i have to adjust intake and exhaust valves at cold? (i adjust only 0.35mm) It is the problem to cause wearing on rocker arms too? Im afraid incorrect valve gap cause any damage on the cam.
I think i make a mess...

What does it means valve lift 0.420?

Im new in engine modifications, please help me

Thanks

Luis

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Hi!

I will see why i have no oil on cylinder head (blocked oil channel? (cut the gasket or talk with the machinist if is the problem ), and set up all again with standard rocker arms (i will need one at perfect conditions) double springs standard pushrods and 720 lifters that im using

If you have any improvement, please let me know

Its being dificult wake up this engine

Many thanks for all replies

Luis

Luigi, as Dave said the A12 bolt would be the right one. My mistake was using the A12 bolt in the A15 block which partially obscure the oil passage. In my case it destroyed the rocker shaft as well as the rockers.

I would take the plugs out and the rocker shaft assembly off the head, then crank it over on the starter and see if you are getting oil squirting out. Should only take 2-3 seconds.

Also check the aluminum rocker tower that's over the oiling hole to see if its plugged.

the A12 bolts with A12 block is correct

Hi!

Thanks for your replies.

I bought my double springs, seats and retainers from BProjects, the grind of my camshaft is not agressive total intake timing 266º total exhaust timing 266º (Iskenderian Grind). I think i used a T bOLT FROM MY a12 Engine on A14 cylinder Head. Its a Problem?

I understand the problem of cylinder head is more lubrification..

I wil make the engine run properly. At the moment i set up the normal A12 engine (so soomth sound)

Thanks Again

Luis

Quote:Double springs do not cause wear like that

Rocker arms are not made of soft material. Your engine has an oiling problem




T bolt



A14 head used on early (1970-1973) A12 engine -- A14 head does not have the oiling hole


If A14 center bolt is used on A12 block it won't work correctly. Must use A12 center bolt which narrows down in the correct area


Oil passage must be added, or a slot cut in the head, or a slot cut in the head gasket

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Luigi

Before you oil the head off check some of the other parts:

Check that all the rocker pedestals will flow, you can use a syringe or oil pump can.

After that with the rocker assembly off crank the car over with the starter motor and see if it squirts oil out of the head.

Check the T bolt and make sure it's the correct one, the A14/15 T bolt is different from the A12, it's likely not a problem on your set up.


I do have a couple of other questions; where did the valve springs come from? Any chance the springs are near coil binding? How aggressive is the cam grind?

I feel you pain, when I put the A15 in my coupe years ago I got it spectacularly wrong. I had an oddball T-bolt, while longer than the A12 one it was two short for A15 and while it torgued done to spec it just didn't feel right yet I ran it anyway. While it was fine during the break-in it made it a lap and a half and popped the head gasket. When I pulled it apart it was clear the rockers weren't getting enough to oil. So along with having to weld up the head surface and have it milled I had to replace the entire rocker assembly. It didn't end there because when the head gasket went it also did minor damage to,the valve seats. I was frantically trying to the motor running for a race and never even thought to a leak down. I actually swapped out short blocks and it was only after I bolted the head back on and it wouldn't start that I knew it was the head. I actually ended up buying a second race prepped GX head while I sorted out the motor. I was ready to stick my head in a vise before I figured it out.

Tom

hI!

You told me that the cylinder has not the sufficient lubrification and i agree, because the rocker has no indication of oil.. neither the interior of rocker shaft, the oil comes into cylinder head through the pushrods.....
I will dismantle the cylinder, and i will see ths oil hole block not match with the cylinder head.
The machinist makes a mess

Thanks

Luis

Hi!

I had made what you said, i removed the spark plugs and install rocker arms adjust valves, and turn the engine.

Conclusion
Without rocker arms, and without plugs its easy turn the engine
with rockers arms, without spark plugs its necessary more strenght.
Rocker arms have no prision have soft movement, i think its the the double springs causes hardness....on turning engine and causes wearing on rocker arms or mine rocker arms are made made with soft material???? So many people uses double springs and have no problems with standard rocker arms, pushrods?

Thanks

Luis

Normal compression makes the engine difficult to turn over

To determine if it's the rockers or the compression, keep the valves adjusted but remove the spark plugs. If you are able to easily turn the engine, then it's not the rockers