CMB 91HR timing numbers

[Don Ferrette]

I have a CMB 91HR (not the VAC) motor here that I'm looking over for a friend and the stock timing numbers on the boost and transfers seem rather high to me. I checked the measurements twice before I plugged them into my EAP program and I'm seeing some tall mumbers come back. Anybody out there who is or has run one of these and checked the numbers, what kind of stock boost, transfer and exhaust timing did you see? :blink:

 

[julianconde]

Don get ahold of david wilfong

julian

 

[Anders_Martinelle]

Don, the highest i have seen is 140deg.

Anders

 

[Don Ferrette]

Don, the highest i have seen is 140deg.

Anders

Ok so I'm not losing it, I got 138 boost and 137 transfers. To get the blow down where I would like it to be would make for some rather stout exhaust timing..... :blink:

 

[Anders_Martinelle]

Remove some of the flange and then adjust the exhaust and you will be fine if you not like the high transfer and boost timings.

Anders

 

[dwilfong]

the VAC I checked 3 times before I believed it.

Yes thy are very high 136 trans139 boost 188ex on the VAC.

With the long stroke and long rod it gives more time the window is open. the long rod and long stroke mess with the speed the piston comes of the bottom.

a shorter rod in this eng would change the whole story. the power would come in at a lower RPM.

Needs a 101 P/L and rod in it. :unsure:

David

 

[Joe Warren]

the VAC I checked 3 times before I believed it.

Yes thy are very high 136 trans139 boost 188ex on the VAC.

With the long stroke and long rod it gives more time the window is open. the long rod and long stroke mess with the speed the piston comes of the bottom.

a shorter rod in this eng would change the whole story. the power would come in at a lower RPM.

Needs a 101 P/L and rod in it. :unsure:

David

yes I would like to see a VAC 101 too......

 

[dwilfong]

the VAC I checked 3 times before I believed it.

Yes thy are very high 136 trans139 boost 188ex on the VAC.

With the long stroke and long rod it gives more time the window is open. the long rod and long stroke mess with the speed the piston comes of the bottom.

a shorter rod in this eng would change the whole story. the power would come in at a lower RPM.

Needs a 101 P/L and rod in it. :unsure:

David

yes I would like to see a VAC 101 too......

It will be a 1.05 and it is comming soon.