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steelcomp was here
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Discussion Starter #1
Just got back from the Vrbancic Brother's dyno today with some real nice results.
Gen6 509
4.5 bore x 4.0 str.
Scat std. weight crank
Engine Pro 6.535 rods
Mahle 13cc dome piston, 1.27 ch
11.4:1 cr
AFR 305's fully ported (309cc), 2.25 valve, 103cc chamber
Straub hyd roller 244/248 @ .05 .649/.629, 107
Morel hyd. roller lifter.
Ede. Vic Jr, fully ported , Pro Systems 1000 4150.

Corrected (.04)
764hp @ 6200
732 lbs/ft @ 4900



 

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steelcomp was here
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Discussion Starter #3 (Edited)
I take it that the pistons set a little proud and you're running a thick head gasket.
Yessir... .011 out of the hole with a .050 Cometic. The block was 9.798 to start and needed a little "work" to get it flat and even. In the end it worked out really well.
 

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Just got back from the Vrbancic Brother's dyno today with some real nice results.
Gen6 509
4.5 bore x 4.0 str.
Scat std. weight crank
Engine Pro 6.535 rods
Mahle 13cc dome piston, 1.27 ch
11.4:1 cr
AFR 305's fully ported (309cc), 2.25 valve, 103cc chamber
Straub hyd roller 244/248 @ .05 .649/.629, 107
Morel hyd. roller lifter.
Ede. Vic Jr, fully ported , Pro Systems 1000 4150.

Corrected (.04)
764hp @ 6200
732 lbs/ft @ 4900



Enjoyed it bud. Kudo's to you and your skill level. I think you need to note the old engine was dyno'd on the same dyno and it make 652HP/654#/ft and car, 1966 Chevelle, ran a best of a 10.15. Scott port tuning and complete Blueprinting netted a very nice gain in power.
 

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Congrates on the build Scott! Another fine job:thumb:.. ...I guess this means the "Foxwell-Billet" build is about to begin!!!:happy:
 

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steelcomp was here
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Discussion Starter #10
Just wanted to add: it made 746hp @ 6100 and 720ft lbs @ 4800 at 32 degrees total timing....a loss of 18hp and 12ft lbs on the race gas. You could throw 91 0r 93 oct. in this thing and never give it a second thought.
 

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Do you have any pics of the pistons or the 103 chambers... I would like to see what was done to the chambers to run the 4.500 bore and keep the chambers down to 103 cc and also what cc dome if any did you use. looks like a good combo.
ps.whats it going in car or boat?
 

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Do you have any pics of the pistons or the 103 chambers... I would like to see what was done to the chambers to run the 4.500 bore and keep the chambers down to 103 cc and also what cc dome if any did you use. looks like a good combo.
ps.whats it going in car or boat?
Pistons were shelf stock Mahles BBC1270500D13's. Mahle Rings.

Scott has a whole pictorial on this I will tell him to post it.
 

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Pistons were shelf stock Mahles BBC1270500D13's. Mahle Rings.

Scott has a whole pictorial on this I will tell him to post it.
Ah Chris, you need to stop doing that from memory. There is no 1 after the BBC. Your mind threw that in there because it seems logical:D Its my guess that Mahle figures that is a given, just as the 4 is. Makes for a shorter part number. At least their numbers make sense.



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:clapping: Good job on a nice build!
 

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Do you have any pics of the pistons or the 103 chambers... I would like to see what was done to the chambers to run the 4.500 bore and keep the chambers down to 103 cc and also what cc dome if any did you use. looks like a good combo.
ps.whats it going in car or boat?
Pistons were shelf stock Mahles BBC1270500D13's. Mahle Rings.

Scott has a whole pictorial on this I will tell him to post it.

Same piston I put in the 540. There is a pic of it in my build thread.
 

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steelcomp was here
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Discussion Starter #17
Do you have any pics of the pistons or the 103 chambers... I would like to see what was done to the chambers to run the 4.500 bore and keep the chambers down to 103 cc and also what cc dome if any did you use. looks like a good combo.
ps.whats it going in car or boat?
The heads were pretty heavily angle milled. Dome was 13cc as Chris said. Nothing exotic...all off-the-shelf parts.






 

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You really are such a hack. You need to get into something that requires less finese and skill. Like making small rocks out of big ones, or breaking anvils.;)

Were the heads already angle milled to that CC when you got the engine, or did you go there to get the compression for the available pistons.

Maybe its my hack math, but given the numbers you posted and ASSUMING others, the compression appears to come out closer to 12 to 1. If it is, that 107 LSA has to be helping. Is installed straight up?



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Very nice , 509

Pump gas friendly, with race gas power numbers !!!

I have been impressed every year at the Parker endurance race on how well the N/A motors run and to just limited to 525 inches, putting them in the front of the pack of the GN's

I think you have a good start for 300 mile endurance motor
 
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