results of added compression to 511

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.

Here's a vid. https://youtu.be/JI2ndER5ATo

Great job and results!

Congrats Dave! Work on that 60'...It has some more in it! Ted

Nice pick up everywhere. Foot braking?

Nice.
Enough MPH to get into the 9’s pretty easily
What track were you at?

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....

Nice! Great looking car

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

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.

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.

I agree 100% Don. Too low of compression for the cam and the heads. Compression coaxes the air thru the head and the higher it is the faster the air movement and these heads need all the help they can get IMO. Here's another vid. I was almost out of gas, had about 1.5 gallons left. The gauge reads E and the pressure gauge reads low pressure after heating the tires. Had to wait for fuel pressure before I could stage and shut the pump off at the end of the track to save the pump. https://youtu.be/rScO2Oa34qY

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.

that's great result . thanks for the feedback .

Tex

You got a lot of bang for your work and investment
I've raise the compression on my old M.W. stocker form 10.8 to 11.5 to 1 and didn't see anywhere near those results
My old pump gas Duster responded differently though, it liked all the changes I made to it

I think the glove box door being open helped with wind drag ....nice outing and congrats on the new best

Cab, I did all the reseach I could about these under performing heads and what I noticed was they need 12:1 minimum compression to perform well. Anyone running these heads with less than that were not getting good results IMO. I don't know what Edelbrock did with these ports, but i'm thinking there shaped wrong. I know Dwayne said the valve is almost the same size as the port throat under it. I think the Indy tunnel ram with the Thumper 750's will easily put me into the 9's. Then a cam change to something more aggressive and maybe 9.80's or better? I could have run it with the air clearer or the 4 hole tapered spacer and busted into the 9's, but I ran out of fuel. I can't believe 7 or 8 gallons of fuel was used in 6 passes. Where did all that fuel go? Thought I had plenty, but it cut my day short.

I have asked before but I forgot, what is the race weight ?

yeah, for sure. If I don't open it, it will open itself on launch. One other thing I did was report the Indy intake. Forgot about that.

Race weight is 3380. I'm gonna have to check Wallace calculators for hp. I'm curious.

A lot of fuel is used in the drive up/back and the burnout

You are probably around 650 crank hp these days. Might have picked up 40 or 50 hp from the change. 134 mph is fast enough to dip into the 9's. Probably just need to find a little more traction off the line or change the launch process. It is still a street driver right? So you are probably limited on how radical you can get with the chassis and launch.

Yes, street/strip all the way, mostly street. I think its a high 9 car, just need to find it. Gonna keep pushin on for 700hp. Indy tunnel ram is next then a more aggressive cam.

Yeah, it burns some fuel for sure. Went with over a half tank and thought it would be enough. Oh and this 12.5:1 compression motor runs on 98 octane with no sign of detonation. Timing was left at 36*. I had penty of engine builders telling me it needs 110 all the time. Don't let anyone fool you, IMO 110 isn't needed with 12.5:1 in a 511 with under 7000rpm usage. I think there are many racers out there leaving power on the table by over octaning. I may get away with 96 octane. I'll let ya know.

My small block is 11.2-1, it made 30 more hp on pump 93 than 98 race gas on a engine dyno.

Awesome results, that's quite an improvement.

Yes my 11.25 408 was fastest on straight pump gas.

Nice run, 662fwhp>

60 Foot E.T. : 1.39
1/8 Mile E.T. : 6.33
1/8 Mile Trap Speed : 107.40
1/4 Mile E.T. : 10.03
1/4 Mile Trap Speed : 134

Making the assumption that the earlier runs were at Milan on 9-1-2019. The D/A yesterday from 10-4 ranged 254-1223. The previous date at the same times1284-1873. So some of your improvements were due to weather. A gain none the less. As far as fuel consumption. Last week a Mid Michigan we made 9 passes. Used just under 5 gallons. This weekend at Dragway 42 we were pitted at the end of the track. The runs were over a 2 day period. The run times were further apart. This entailed more warm up. 7 passes 5 gallons.
Doug

I can think of a few things that I could have done while there that may have put me into the 9 zone. One would be tighten up the rear shock because the separation is huge, two would be putting the wilsons 4 hole tapered spacer on and three, set my shift lite on 62 or 6300 so it gets shifted by 6600. I was a bit slow on the draw. Here’s the next project.

Yes and no. I ran at Mid Michigan the weekend before I went to Milan, so two weeks in a row, but MM was first and the air seemed to be just as good as this past Saturday. Please check the weather on Aug 30 2019 at 9.37PM. That was the time of the 10.401@129.75 pass. Thanks
I ran that weekend without the mechanical fan, then I put the mechanical fan on and went to Milan the next weelend to see what HP it would cost me, but the weather sucked and I lost 2 tenths and 2mph. I'm thinking the weather cost me a tenth and the fan another tenth.

I don’t know how you test n tuners test n tune without your own equipment to check air conditions. Online corrected conditions only tell part of the story.

About 640-
My W5 deal weighed 3350 and went 135, figured it for 640 too

Thats a GREAT point

Ok, thanks for the info Don. I was at MM one weekend when you were there with your old car, seen it run. It is a bad ass for sure small block.

My guess is once your combo settles in, it will run in the 9.80’s with a little tweeking
Its really coming around

Out of curiousity, what convertor and where does it flash

Vert is an 8” Dynamic refreshed by Lenny. Flashes 5400.

Nice big difference what compressing ratio did buddy of mine just put together a 424 SB with 10.50 C/R with a big cam told him good luck it will be a dog.

my 416 is 10:1 with a 272@.050 .658 lift at the valve solid roller. Runs on 91 octane and has been 10.54 in a 3550lb street car. But I agree more compression is usually always better.

What I learned at Pettis Performance years ago was that going from say 9.5 to 11.5 comp. made way more power than going from 12.1 to 14.1 fwiw. On another note however, I have a customer w/a 3450 lb Chevelle on 93 pump gas w/a 572 at 11.7 comp. that went a best of 8.84 at 151 w/a 2-circuit cast 1250 Dommy..........

Yes, it does work that way. The compression scale is shaped like a pyramid.

He may get away with 11.5 on pump gas and run a whole lot better.

I think that's extremely lucky with 10:1 from what I have seen. Maybe you just have real good cylinder heads with high velocity ports? My old 408 went 10.38@131 on 11.25:1 at 3300# with a 268@50 roller.

I just ran my 10.5:1 512 out at milan Wednesday. Car didn’t hook with the 6 year old drag radials. I gotta think it’s 3450 with me in it. All steel 69 dart except for the hood and front bumper. First time out with this combo, I have some work to do. I did make some other better passes earlier in the evening but the timing system was down. I think it’s more about combo than anything.

Looks like there’s a “9” in it with some tires.

That’s Andy’s old cam, right?

it is, runs super hard!! Is that one of your grinds?

If it’s the 264/268-108....... then yes, it is.

I thought I might be, damn good running cam.

I was very please with a Comp Cams solid roller similar to this one, it ran really good in my old pump Gas Duster good, 9.993 at 134.7 MPH through a complete to the rear bumper 3 inch exhaust system and air cleaner on at 3450 Lb. with me in it cork up

Nice results definitely started making steam in 2nd half of the track

Nice and congrats. Runs great on pump gas. What's the duration at .200 and what's the lobe lift on that cam? Thanks

Thanks! I also had a mismatched wood carb spacer on it just to keep heat off the carb. Need to find one that fits the cloverleaf.

Thanks

Very nice improvement and congrats on the new bests! Did you change pistons for the compression increase?

No, i shaved the heads .45" i think. I will take off more next time they come off. It loves compression. No more pump gas motors for me, unless its E85.

No more pump gas motors for me, unless its E85.




You will love it

e85 is awesome. I've been running it for years on my small block street/race car. 13:1 compression Eddy head motor, runs 10.19 at 130. If I recall corretly, my car picked up a little over a tenth when I made the switch to e85 on my old 10.8:1 compression small block.