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results of added compression to 511
#2780001
05/31/20 10:41 AM
05/31/20 10:41 AM
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Joined: Jan 2007
Posts: 8,031
Mt Morris Michigan
mopar dave
OP
master
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OP
master
Joined: Jan 2007
Posts: 8,031
Mt Morris Michigan
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As some may remember my post on added compression and the 1 point of compression not doing much but adding a few horsepower to my 511. Old compression 11.26:1 and my current compression 12.5:1. Results: old best with 11.26 was 1040@130 and new best with 12.5 is 10.06@134. There were a few other changes, but nothing that's worth much to the 4mph gain. I once again I will say compression is a big part of your combo and here's the proof.
Last edited by mopar dave; 06/05/20 01:46 PM.
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Re: results of added compression to 511
[Re: justinp61]
#2780043
05/31/20 12:27 PM
05/31/20 12:27 PM
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Joined: Jan 2003
Posts: 11,705
Portage,michigan
B3422W5
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 11,705
Portage,michigan
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Nice.
Enough MPH to get into the 9’s pretty easily
What track were you at?
69 Dart GTS A4 Silver All steel, flat factory hood, 3360race weight
418 BPE factory replacement headed stroker, 565 lift solid cam
Best so far, 10.40 @127 1/4
1.41 best 60 foot
6.60 at 103.90 1/8
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Re: results of added compression to 511
[Re: mopar dave]
#2780065
05/31/20 01:05 PM
05/31/20 01:05 PM
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Joined: Jul 2004
Posts: 19,317
State of confusion
Thumperdart
I Live Here
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I Live Here
Joined: Jul 2004
Posts: 19,317
State of confusion
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I said it all along that your combo was off in a BIG way and now you proved it......Congrats and the t-ram will add more trust me....
Last edited by Thumperdart; 05/31/20 01:07 PM.
72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....
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Re: results of added compression to 511
[Re: mopar dave]
#2780085
05/31/20 02:34 PM
05/31/20 02:34 PM
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Joined: Jan 2003
Posts: 11,705
Portage,michigan
B3422W5
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 11,705
Portage,michigan
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Thanks guys. The best its ever launched and ran. I was really happy yesterday, that doesn't happen at the track too often. I'll say it again, compression compression compression, especially with these MW Victor heads. They need compression to flow properly, why, I don't know. Something not right with the ports is my guess. I was at Mid Michigan and the track was prepped real good. Never spun the radials except one pass and it was my fault. I foot braked and left at 2500 every pass. I set the shift lite at 6600 and anything more slowed it down a bit. Only made carb adjustments and shock adjustments. I was crossing with 12.8-13.0 on the AF meter. Only carb adjust I made was to the HSB. The .030 were faster than the .028 for sure. I was pulling big wheelies( 1ft) so I thighten the front rebound 1 click on the Vikings and got it down to what you see in the vid. It may be worth some ET to tighten one more click. I left the Caltrac shocks on 5 the whole time because the radials were dead hooking. Thanks for the awesome carb Dom. I'll post the inside gopro vid when I get it loaded. Personally, i think the camshaft was way to big for the previous compression. Has a tendency to make everything lazy. The extra compression has made everything work together much better. Just my opinion. Regards the wheelies, one foot isnt much with a leafspring car at all. But i agree, if you can continue to hit the tire enough to make it stick, by tightening up the front, abd get away with it... great job. you may see that not work on a more marginal track
69 Dart GTS A4 Silver All steel, flat factory hood, 3360race weight
418 BPE factory replacement headed stroker, 565 lift solid cam
Best so far, 10.40 @127 1/4
1.41 best 60 foot
6.60 at 103.90 1/8
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Re: results of added compression to 511
[Re: mopar dave]
#2780092
05/31/20 03:37 PM
05/31/20 03:37 PM
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Joined: Oct 2007
Posts: 4,205
New York
polyspheric
master
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master
Joined: Oct 2007
Posts: 4,205
New York
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They need compression to flow properly, why, I don't know.
Smaller chamber increases intake vacuum and makes pressure changes during overlap more rapid: all good.
Boffin Emeritus
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Re: results of added compression to 511
[Re: mopar dave]
#2780093
05/31/20 03:38 PM
05/31/20 03:38 PM
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Joined: Sep 2014
Posts: 4,457
Washington
madscientist
master
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master
Joined: Sep 2014
Posts: 4,457
Washington
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Thanks guys. The best its ever launched and ran. I was really happy yesterday, that doesn't happen at the track too often. I'll say it again, compression compression compression, especially with these MW Victor heads. They need compression to flow properly, why, I don't know. Something not right with the ports is my guess. I was at Mid Michigan and the track was prepped real good. Never spun the radials except one pass and it was my fault. I foot braked and left at 2500 every pass. I set the shift lite at 6600 and anything more slowed it down a bit. Only made carb adjustments and shock adjustments. I was crossing with 12.8-13.0 on the AF meter. Only carb adjust I made was to the HSB. The .030 were faster than the .028 for sure. I was pulling big wheelies( 1ft) so I thighten the front rebound 1 click on the Vikings and got it down to what you see in the vid. It may be worth some ET to tighten one more click. I left the Caltrac shocks on 5 the whole time because the radials were dead hooking. Thanks for the awesome carb Dom. I'll post the inside gopro vid when I get it loaded. It’s not just those heads that like compression. They ALL like compression, even on pump gas IF you do it right. Building anything for pump gas under 11:1 is leaving a lot on the table.
Just because you think it won't make it true. Horsepower is KING. To dispute this is stupid. C. Alston
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Re: results of added compression to 511
[Re: Thumperdart]
#2780107
05/31/20 05:01 PM
05/31/20 05:01 PM
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Joined: Jan 2003
Posts: 9,983
Frostbitefalls MN (Rocky&Bullw...
gregsdart
master
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master
Joined: Jan 2003
Posts: 9,983
Frostbitefalls MN (Rocky&Bullw...
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I said it all along that your combo was off in a BIG way and now you proved it......Congrats and the t-ram will add more trust me.... the right tunnelram will require a chassis cert and a license gauranteed. If you find one of the older designs porting may be needed for best results.
8..603 156 mph best, 2905 lbs 549, indy 572-13, alky
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Re: results of added compression to 511
[Re: gregsdart]
#2780117
05/31/20 05:29 PM
05/31/20 05:29 PM
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Joined: Mar 2009
Posts: 2,457
Sydney,Australia
tex013
top fuel
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top fuel
Joined: Mar 2009
Posts: 2,457
Sydney,Australia
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that's great result . thanks for the feedback .
Tex
New best ET 10.259@129.65 .
New best MPH 130.32
Finally fitted a solid cam,
stepped it up a bit more
3690lbs through the mufflers
New World block 3780lbs 10.278@130.80 . Wowser 10.253@130.24 footbraking from 1500rpm
Power by Tex's Automotive
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Re: results of added compression to 511
[Re: Cab_Burge]
#2780158
05/31/20 07:26 PM
05/31/20 07:26 PM
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Joined: May 2005
Posts: 1,030
ohio
67mprfan
super stock
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super stock
Joined: May 2005
Posts: 1,030
ohio
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I think the glove box door being open helped with wind drag ....nice outing and congrats on the new best
71 demon stock stroke 440/indy ez-1 running 10.10 @ 132.14 mph in the 1/4 and 6.36 @ 107.46 mph in the 1/8 not in the same weekend but It did it then I sold it.
67 Belvedere that worked it's way in the 10's
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Re: results of added compression to 511
[Re: mopar dave]
#2780164
05/31/20 08:04 PM
05/31/20 08:04 PM
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Joined: Aug 2011
Posts: 2,853
Pattison Texas
CSK
master
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master
Joined: Aug 2011
Posts: 2,853
Pattison Texas
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I have asked before but I forgot, what is the race weight ?
1968 Charger COLD A/C Hilborn EFI
512ci 9.7 compression, Stealth heads, 4.10 gear A518 ODtrans 4100lb,10.93 full street car trim
2020 T/A 392 Stock 11.79 @ 114.5
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