I dynod my 355 tested several things I am sharing

[WeingartnerRacing]

Here is the combo
355sbc
4.030x3.48
11.97 compression ratio
My ported Brodix Dragon Slayer head 241cc 2.63csa 2.08/1.6 valves hollow stem intake valve they flowed 322cfm on a 4.030 bore
Ported Brodix Bm100 intake
1000cfm Race demon carb used as gas and methanol
252/258@ 0.050 108LSA installed at 106 .780/.688 cam
Best headers 1 7/8 stepped to 2inch with 3.5inch collector
No vacuum pump or evac set up.

Here is how it went and some reasons. First I built a 355 because I wanted a test engine that I wouldn't feel bad if it blew up or sucked. I had this 355 because I used it in the 2007emc. The cylinders got honed and installed longer 6inch rods and SRP proffesional series pistons with a small dome. All other parts were picked because I wanted to test things. For instance 241cc should be way too big according to the internet for a 355. I wanted to see what it would really do. I had never used this new brodix intake so why not try using it. The cam I had never used the QRI lobes so time to try that. Is methanol really that much better than gas? I wanted to find out? What about bigger headers hurting power. I had heard several things that on the internet that from previous testing hadn't shown to be correct for me. Let's just see.

The dyno actually started on a down side within 2minutes of firing it a loud squeal was heard. Shut it down and found out the roller cam button in the Cloyes timing cover had failed. Changed that and started making runs. Initially it was on 91octane Casey gas station gas. Timing was at 30degrees. First pulls were 3500-5500. When it first loaded it would slightly rattle but then went away. As the pulls kept increasing in rpm we raised the lower limit too. Then it never did it again. So that pump gas will work with this compression ratio but you have to take out timing down low. Here is a run down of tests and there changes.

Timing from 30 to 33 degrees netted about 50hp
Timing from 33 to 36 degrees netted 10hp it was left there for the rest of the testing.
I added the race gas additive to bring the octane to 98 it gained 2hp
Changed headers to 1 3/4 to 1 7/8 with a merge collector 3inch it lost 4hp. I tried different jetting it was solidly down.
Switched the race demon to methanol. (you change boosters, metering blocks, bleeds, squirters, needle and seat) It gained about 10hp and 20ft lbs of torque
Peak torque gas was 515tq@ 6100rpm
Peak torque methanol was 537.5@5900-6000rpm
Peak horsepower gas 662hp@7300rpm
Peak horsepower methanol 672.6@7400rpm

Strange thing though when it was fat on methanol to begin with it made its best torque at 542.

I made about 20 pulls 15 were between 5500-7500 rpm
I did make a couple of pulls on gas to 7800rpm it went like this(This was with the smaller headers)
7000-646
7100-649.9
7200-653.2
7300-654.8
7400-656.3
7500-656.0
7600-654.8
7700-650.9
7800-648.1

It hung in good.

It probably has a 680 in it but I had to be somewhere in the evening and called it quits. The EGTs were just starting to get to 1050

I would love to post pics but without photobucket I have no idea how.

[1989TransAm]

"It hung in good. "

It sure did. Interesting on going to the 1 7/8" headers that it lost a little power. Thank You for posting your results.

[user-9274568]

Between Weingartner Racing and SRH the 23º community is alive and well.

Nice work.

[plovett]

Impressive! Especially with the small bore and relatively small cam.

And thanks for posting the results, instead of going to Kazakhstan for 3 weeks and then maybe posting them if we showed enough interest.

paulie

[GARY C]

At that rpm range I could see the need for a bigger head, I built one similar for a nitrous application (theory test) N/A power sucked compared to yours but peak power was at 7700...well thats where the pull stopped. Cam was a little bigger and on a 118 lsa.
On nitrous the peak power rpm dropped to 74/7500 range which is what we had planned.

[treyrags]

Is your timing fully advanced in the rpm range it was rattling?

[Carnut1]

Great job Eric! Thanks for sharing. I would be glad to run this head through DV's port energy program for you. Thanks, Charlie

[woody b]

On methanol drop the timing 2 to 4 degrees and lean it a little from jetting used at 36 degrees.

[WeingartnerRacing]

Impressive! Especially with the small bore and relatively small cam.

And thanks for posting the results, instead of going to Kazakhstan for 3 weeks and then maybe posting them if we showed enough interest.

paulie

Yeah I like to give all information up front of but I am not trying to sell a book. Any of you guys can ask me anything about this I don’t care.

[WeingartnerRacing]

Great job Eric! Thanks for sharing. I would be glad to run this head through DV's port energy program for you. Thanks, Charlie

You can if you want just tell me what you need but I am fairly certain it will look wrong.

[plovett]

Cool, Thanks.

What do you think you could gain with a 4.155" bore?

paulie

[WeingartnerRacing]

Is your timing fully advanced in the rpm range it was rattling?

I had timing locked. Here is something strange that happened I was using a 7al-2. It had a 8000rpm chip it kicked in at 7500 switched to 9000rpm chip problem solved. I will try a Daytona sensor ignition in the car.

[WeingartnerRacing]

Cool, Thanks.

What do you think you could gain with a 4.155" bore?

paulie

If I had done a 4.155 bore with a smaller stroke I think I could have gained maybe 20 because these flowed 330s on 4.155 bore so a definite gain there.

[Carnut1]

Great job Eric! Thanks for sharing. I would be glad to run this head through DV's port energy program for you. Thanks, Charlie

You can if you want just tell me what you need but I am fairly certain it will look wrong.

0827171457.jpg

Actually Eric I think it will be very close to my Dart 200's that are 247 cc. Info on spec sheet that I need. Port cc, port lengths, flange sizes, valve diameters, throat diameters, flows from .05" to .7" lift, with or without exhaust pipe. Any questions just message me. Thanks, Charlie

[kimosabi]

"For instance 241cc should be way too big "

How did it perform under 4000rpm, as that is the common argument on big ports.