[DeTomaso] 5481 New heart beat

[mark skwarek]

I have had some issues with my former engine's build. I decided to send it to Mclains Automotive in Cuba, MO. I can't say enough about how great it is to work with Dave and Dan on this project. The results are beyond my expectations.

Dave Mclain wrote:

I've been doing some work on the engine this morning and so far I'm at 600 horsepower at 6650rpm and 517lbs/ft torque at 5000.  Best combo so far is with 30 degrees timing and an HVH 1 inch merge spacer.  Here's a screen capture from a pull that I made a few minutes ago.  I'm going to break for lunch soon but I think I might mess with the jetting a bit and call it good.  This is with Dan Jones' Pantera headers flowing into a 2.5 inch glasspack muffler.  Another thing I want to do is change the bushing in this distributor to shorten up the curve which is way too long.  This will help to make the idle more consistent and I don't think it'll make it tough to start hot.  It would be best locked out but I don't know if you have a provision to spin the engine and then light the spark.
For the next pull I swapped on my 950 HP that was built by Competition Carburetion just to see what was "in" the carburetor.  The engine made the same overall torque numbers but picked up 17 horsepower at the peak.  This carburetor is not necessarily the ultimate Holley or anything but it was built to be a good all around carburetor for testing on lots of different engines.

Dan Jones wrote:
 
That's with the smallest cam I ran through Dynomation.  The simulation prediction was for just under 600 HP and Dave thought that might be a bit optimistic.  I was pretty sure we'd get close to 600 HP but 617 HP through the mufflers is impressive, not to mention how flat the torque curve is.  Those old Ford Motorsport heads really work well.  Looking forward to how it performs in your Pantera.  


Mark
5481
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   I have had some issues with my former engine's build. I decided to send
   it to Mclains Automotive in Cuba, MO. I can't say enough about how
   great it is to work with Dave and Dan on this project. The results are
   beyond my expectations.
   Dave Mclain wrote:
   I've been doing some work on the engine this morning and so far I'm at
   600 horsepower at 6650rpm and 517lbs/ft torque at 5000.  Best combo so
   far is with 30 degrees timing and an HVH 1 inch merge spacer.  Here's a
   screen capture from a pull that I made a few minutes ago.  I'm going to
   break for lunch soon but I think I might mess with the jetting a bit
   and call it good.  This is with Dan Jones' Pantera headers flowing into
   a 2.5 inch glasspack muffler.  Another thing I want to do is change the
   bushing in this distributor to shorten up the curve which is way too
   long.  This will help to make the idle more consistent and I don't
   think it'll make it tough to start hot.  It would be best locked out
   but I don't know if you have a provision to spin the engine and then
   light the spark.
   For the next pull I swapped on my 950 HP that was built by Competition
   Carburetion just to see what was "in" the carburetor.  The engine made
   the same overall torque numbers but picked up 17 horsepower at the
   peak.  This carburetor is not necessarily the ultimate Holley or
   anything but it was built to be a good all around carburetor for
   testing on lots of different engines.
   Dan Jones wrote:
   That's with the smallest cam I ran through Dynomation.  The simulation
   prediction was for just under 600 HP and Dave thought that might be a
   bit optimistic.  I was pretty sure we'd get close to 600 HP but 617 HP
   through the mufflers is impressive, not to mention how flat the torque
   curve is.  Those old Ford Motorsport heads really work well.  Looking
   forward to how it performs in your Pantera.
   Mark
   5481
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