Technical > Matt Shaff's Engine Shop

Compression ratio question

<< < (2/3) > >>

coupemerc:
Our TAD was a roots blown 438 CI Hemi. The most we could get out of it for compression was 11.8/1. It was hard to make any more compression than that due to the combination of the short 3.750 stroke and the piston to head clearance required. The funny car guys back then typically made more compression (around 12.2/1) because they had more stroke to help them out. They were typically 526 CI

George:
We are at 10.3:1 with our Iron SBC. A 4.133 X 3.48 engine. It has been plenty fast enough and very reliable.

Supercat:
Thanks for the replies everyone.
We should be around 11:1 from all we are looking at.
I can put a thinner gasket in to raise things up some, if needed later.
Any ideas on a fuel pump size I have a few to chose from.

Paul New:

--- Quote from: Supercat on January 24, 2018, 04:10:05 PM ---Thanks for the replies everyone.
We should be around 11:1 from all we are looking at.
I can put a thinner gasket in to raise things up some, if needed later.
Any ideas on a fuel pump size I have a few to chose from.

--- End quote ---
What HP are you shooting for?

Supercat:
We are not trying to hit a certain HP level per say.
We are trying to get the highest level of HP and back things down to a reliable amount knowing we have more if needed.
We are trying to hit 215+ mph.
That is the Buick record. We may run TD if it is allowed?
Haven't looked into if there are any FEDs running in the class in Division1 or Nationally. Anyone know of any?
We will be running the engine at 496 cu.in. with either the 671 or this F3R ProCharger under the body.
Compression ratio of about 10.75
Thanks again for the info.

Navigation

[0] Message Index

[#] Next page

[*] Previous page