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#1251148 Tue Jan 16 2018 03:53 AM
Joined: Dec 2008
Posts: 1,106
5
'Bolter
Being a X drag racer, I have a couple of MSD 6AL boxes sitting around, I was thinking about putting one on my stock 55.2 235 TF 3100 truck with stock ignition. I'd just be out my time, and no money involved. Would there be anything to gain by this, or am I just peeing in the wind?
TIA.


Brian
1955.2 3100 Truck


The older I get the more dangerous I am!!!!!
55shaker #1251154 Tue Jan 16 2018 04:32 AM
Joined: Feb 2004
Posts: 25,002
H
Kettle Custodian (pot stirrer)
Be sure to keep the wind at your back.

While there might be an advantage to firing a plug 4 or 5 times in rapid succession in a well-shaped combustion chamber with the uneven charge density in a turbulent mixture in a drag race engine, I can't see any advantage to doing it in a stovebolt chamber at low speed. Look at the shape of that chamber, and the position of the spark plug- - - - -it would be hard to intentionally design something worse!

In my decidedly biased opinion, doing race stuff to a street engine is a big waste of time and effort. If you have to buy the stuff you're installing, it really makes no sense!
Jerry



"Freedom's just another word for nothing left to lose"
Kris Kristofferson

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!

There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self.
Ernest Hemingway

WAG MORE- - - - - -BARK LESS!
55shaker #1251174 Tue Jan 16 2018 12:31 PM
Joined: Sep 2013
Posts: 1,421
M
'Bolter
I agree with Jerry in that I sure wouldn't buy a MSD box, but since you have one already why not install it and post up the results. I've got a Summit clone stuck back somewhere, just never thought about using it.....wait, I'm still running 6 volts.


1951 3600 with Clark flatbed, T5, 4.10 rear
1970 340 Duster
1990 5.0 V8 Miata (1990 Mustang Gt Drivetrain)
1964 CJ5



55shaker #1251195 Tue Jan 16 2018 03:04 PM
Joined: Mar 2010
Posts: 926
Y
yar Offline
Shop Shark
"Would there be anything to gain by this, or am I just peeing in the wind?"

Brian,

Isn't the only way to find out to try it and see what happens? I did that on my '71 Dodge van that I bought new with a small block Mopar engine. "71 was the last year for point ignitions on vans. I took a stock Mopar electronic ignition off another van in a self serve wrecking yard and put it on my '71. I immediately noticed better starting when cold and when flooded from heat soak, for example after filling the gas tank.

What harm can come from doing the experiment?

Moparguy, I still have that van and it's still going strong at 361,000 miles. You can't kill that Detroit iron, huh?


Ray
55shaker #1251220 Tue Jan 16 2018 05:11 PM
Joined: Jun 2011
Posts: 4,586
E
'Bolter
Make sure and stay from an electric fence while doing that!

Ed


'37 GMC T-18 w/ DD 4-53T, RTO-610, 6231 aux., '95 GMC running gear, full disc brakes, power steering, 22.5 wheels and tires.
'47 GMC 1 ton w/ 302, NP-540, 4wd, full width Blazer front axle.
'54 GMC 630 w/ 503 gasser, 5 speed, ex fire truck, shortened WB 4', install 8' bed.
'55 GMC 370 w/270, 420 4 speed, grain, dump bed truck from ND. Works OK.
55shaker #1251224 Tue Jan 16 2018 05:48 PM
Joined: Sep 2013
Posts: 1,421
M
'Bolter
Ray said "Moparguy, I still have that van and it's still going strong at 361,000 miles. You can't kill that Detroit iron, huh?"

I've read of 50's vintage AD trucks going well over 200K miles. I do suspect these were highway driven work trucks that didn't spend there life on the farm driving dusty turnrows and dirt and gravel roads.

I'm not really in your league but my bought new 1995 Dodge 1 ton Cummins diesel is pushing 300,000 miles. All I've ever done to the engine is adjust the valves a few times (now I did upgrade the turbo, install bigger injectors and exhaust system, change the springs on the injector pump flyweights and tune on the afc housing smile ). All these enhancements caused the stock clutch to slip in 4th when pulling a loaded trailer so had to upgrade that.

But even with the power being increased by almost 100% I'm thinking I won't live long enough to wear the old Dodge out.

RonR

Thread hijack over, back to the stovebolt.


1951 3600 with Clark flatbed, T5, 4.10 rear
1970 340 Duster
1990 5.0 V8 Miata (1990 Mustang Gt Drivetrain)
1964 CJ5



55shaker #1251233 Tue Jan 16 2018 07:27 PM
Joined: Dec 2008
Posts: 1,106
5
'Bolter
Jerry, Ron, Ray, and Ed, thank you for your replies. My 235 starts and runs like a top. I think I'll just leave it alone (if it ain't broke don't fix it).


Brian
1955.2 3100 Truck


The older I get the more dangerous I am!!!!!
55shaker #1251234 Tue Jan 16 2018 07:27 PM
Joined: Sep 2001
Posts: 31,649
Bubba - Curmudgeon
"I've read of 50's vintage AD trucks going well over 200K miles."

I am not following the banter/bragging, but does someone know of a 216 or a low-pressure 235 going 200K without a rebuild (or, at least a valve job)? I'll bet my 1954 A-D high-pressure 235s were lucky to go 50K miles before lower-end rebuild?

Or, is that 200K road miles on the truck, not on the original engine? Kingpins, rear axle seals, etc, etc . . ?


Tim
1954Advance-Design.com [1954advance-design.com]
1954 3106 Carryall Suburban [stovebolt.com] - part of the family for 49 years
1954 3104 5-window pickup w/Hydra-Matic [1954advance-design.com] - part of the family for 15 years
- If you have to stomp on your foot-pedal starter, either you, or your starter, or your engine, has a problem.
- The 216 and early 235 engines are not "splash oilers" - this is a splash oiler. [chevy.oldcarmanualproject.com]
tclederman #1251261 Tue Jan 16 2018 10:41 PM
Joined: Dec 2017
Posts: 1,172
D
'Bolter
I don't think there is any downside to it. My 261 will get one this coming spring. Yes, the combustion chamber is of a pretty funky and inefficient design which is just why you might consider it. The single throat carb has to feed that motor from idle to wot so there are some compromises built in. One is that at idle and off idle, it can sometimes run a little fat so the multiple sparks might help get you a cleaner more complete burn. As you said, you only have your time in it.


Mike
55shaker #1251269 Wed Jan 17 2018 12:43 AM
Joined: Mar 2010
Posts: 926
Y
yar Offline
Shop Shark
"Jerry, Ron, Ray, and Ed, thank you for your replies. My 235 starts and runs like a top. I think I'll just leave it alone (if it ain't broke don't fix it)."

Brian,

If you're going to stay with a point ignition you might look at a Delco D105P point set. It's listed for early 1960s era vehicles but I found it to be a drop in replacement for the funky 2-piece point set in my '36 Chevy pickup. I've heard that the D105P fits Delco distributors back to the 1920s and it's much improved over the "original" points and really inexpensive on ebay.


Ray
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