SV: [DeTomaso] Pinging.

[Mad Dog Antenucci]

Your timing could be off....Double check your timing to be sure its 38total. 
  md

Kjetil Finne <kjetfinn at online.no> wrote:
  
I have some problem with pinging in low rpm / wot situations
(1500-2500rpm).
If I want to pass a car on the highway, I would sometimes have to gear
down to fourth gear to avoid pinging. Same thing happens when
accelerating in a high gear up long steep hills.
The timing is set at approximately 10dgr initial, and a 38total.
At 2000 rpm in a sit like this the timing wouldn't be more than
approximately 25degrees advanced.
It seems like the problem is caused by the carburettor not being tuned
correctly, or can there be other causes to a problem like this?
When compression testing the engine earlier this year the readings were:
12.5kg (181 psi) pressure on all cylinders.


Intake: Edelbrock Performer.
Heads: Closed chamber Aussie 2V heads .
Cam: Compcam part nr # 32-221-3. Grind nr FC-268H-10
Pistons: 10:1 forged pistons. 0,30" over.
Ignition: Mallory unilite. Promaster coil
Carburettor: Holley 670 Street avenger.





Camshaft Specification Table 
Part Number 32-221-3 
Grind Number FC 268H-10 

Description 

Gross Valve Lift 0.494 0.494 
Duration At 0.006 Tappet Lift 268 268 

Valve Timing At 0.006 
Open Close
Intake 28 60 
Exhaust 68 20 

These Specs Are For The Cam Installed At 106 Intake CL
Intake Exhaust
Duration At 0.05 218 218 
Lobe Lift 0.2853 0.2853 
Lobe Separation 110 



Best Regards

Lisa and Kjetil
Norway


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