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#1
02-15-2007, 02:26 AM
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800HP D Port
The latest dyno results of my 469 cid engine are in. We were able to make a little over 800 naturally aspirated HP with my self imposed limits of OEM block, OEM crank and OEM D port head. It made 806 HP at 6700 and 695 lbs ft Torque at 5100. Volumetric efficiency peaked at a very nice 127.1%.
1969 428 Block; 4.190 bore; Filled to bottom of freeze plugs; 3 center billet caps 9799103 N 455 crank stroked to 4.250; Radiused counterweights to reduce windage 6.782 connecting rod JE flat top pistons Child and Albert gapless rings #48 heads; substantial port work; flowed over 315 cfm with intake and carb; much epoxy 2.110/1.770 REV custom valves 13:1 compression Isky Solid roller cam; approx 270/280 at .050; installed at 105 IC 1.65 Crane gold roller rockers Manton 9.400 pushrods Victor intake welded and heavily ported; polished exterior; 1 spacer 1050 Dominator; tweaked MSD billet distributor; crank trigger 2 Hedman Hustler headers; 30 collector extension Star Vacuum pump Custom built oil pan Best power was made with 32 degrees timing, 10 vacuum pump setting, 88 jets, 145 water temp and 130 oil temp. Built a sheetmetal intake for this combination but it was down on HP and torque slightly from the Victor, long story but I wanted to run the shaker on my 71 TA so some compromises were made in the initial design. We are still working on making this intake work in the car. Best of luck to each of you in 2007, Jim Robertson Robertson Auto Consulting and Engineering www.racev8s.com |
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#2
02-15-2007, 02:32 AM
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WOW!
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#3
02-15-2007, 03:49 AM
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Quote:
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James 1970 Trans Am Spotts Built 484" IA2, Highports, EFI Northwind, E85 Holley Terminator X sequential EFI fabrication and suspension by https://www.funkhouserracecars.com/ |
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#4
02-15-2007, 07:23 AM
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Impressive for a stock block/crank deal!! Any worries with those parts?
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#5
02-15-2007, 08:54 AM
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Jim,
That's very impressive power for a relatively small cube D-port motor. What kind of flow numbers were you getting on those 48's on the exhaust side? Tim C
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Tim Corcoran |
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#6
02-15-2007, 08:58 AM
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Obviously, this was not his first time at the rodeo!
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Tempest455 |
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#7
02-15-2007, 09:01 AM
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For those who haven't looked.......click on Mr. Robertsons web link.
VERY impressive and informative site. The fabrication and craftsmanship is incredible.
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Home of WFO Hyperformance Shaker induction. |
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#8
02-15-2007, 09:17 AM
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LIFT HEAVY, LIFE IS TOO SHORT TO BE SMALL! |
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#9
02-15-2007, 09:27 AM
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I thought 300cfm d-ports was a myth but these pics make me think otherwise.
   
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#10
02-15-2007, 09:39 AM
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Thanks for the kind words. It was a project that I let drag on for three years. The heads took the longest to get them to do what I had envisioned.
Exhaust went 206 cfm @ .700" lift @28" on our bench with the 2" car header attached. Jim |
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#11
02-15-2007, 09:43 AM
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Very Nice!
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#12
02-15-2007, 10:31 AM
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Fantastic Job!
 What's it going in?
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John Wallace - johnta1 Pontiac Power RULES !!! www.wallaceracing.com Winner of Top Class at Pontiac Nationals, 2004 Cordova Winner of Quick 16 At Ames 2004 Pontiac Tripower Nats KRE's MR-1 - 1st 5 second Pontiac block ever! W.E.C moment "Every man has a right to his own opinion, but no man has a right to be wrong in his facts." "People demand freedom of speech to make up for the freedom of thought which they avoid." Socrates |
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#13
02-15-2007, 10:45 AM
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Very impressive.
Didnt even have to go over 7K.
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If you cant drive from gas pump to gas pump across the map, its not a street car. http://s207.photobucket.com/albums/b...hop/?start=100 |
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#14
02-15-2007, 10:48 AM
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gas or alcohol
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#15
02-15-2007, 10:51 AM
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FAR OUT!
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Uneasyrider To find yourself, think for yourself. ― Socrates The unexamined life is not worth living. ― Socrates Wise men speak because they have something to say; fools because they have to say something. ― Plato |
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#16
02-15-2007, 10:55 AM
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I'll bet those aren't 160cc D ports either! They look huge! And not a low rpm D port motor either.
Neat project good luck with it! |
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#17
02-15-2007, 10:57 AM
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Outstanding accomplishment.
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Jack Ferris RestoRacing LLC www.restoracing.com Sandy, UT --------------------------------------------------- |
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#18
02-15-2007, 11:08 AM
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Jim, I am jealous. What a great D-port accomplishment-in fact that would be impressive with aluminum round ports. (Jim is a really nice guy too) cigars were good. LOL
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fasteddy |
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#19
02-15-2007, 11:13 AM
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.......think i'll throw my d-ports out the window.....
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Home of WFO Hyperformance Shaker induction. |
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#20
02-15-2007, 11:25 AM
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Quote:
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Jack Ferris RestoRacing LLC www.restoracing.com Sandy, UT --------------------------------------------------- |
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