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Timing on M

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turbos10

05-12-2007 14:12:05

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Hey all,

I finally got the new engine running in my turbo M puller and I am working on setting the timing. The pulley has two marks on #1 TDC and a single mark 180 degrees around the pulley. Can you guys tell me what timing setting these three marks show? I would like to lock the distributor at 20-22 degrees. Could I be so lucky as to have one of these marks be in this range?

Thanks,

Chris

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M.Rad.

05-13-2007 22:23:42

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How about some pics? That sounds like a monster! in reply to turbos10, 05-12-2007 14:12:05

Any idea how many psi a stock motor could handle?
I"m thinking maybe a half ATM (7psi)?

Regards,
M.R.

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turbos10

05-14-2007 19:09:09

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Re: How about some pics? That sounds like a monst in reply to M.Rad., 05-13-2007 22:23:42

I ran a stock engine at 12 psi in the manifold, which was after an intercooler and carb. It was a 263 with fire crater pistons and 8574 head. Everything was stock other than that. I pulled in 4th gear at 2500RPM. With uncut 18.4 tires I could hardly get the power to the ground. When the clutch gave up is when I decided to build the "monster" as you put it ;). I think the clutch lasted 3 hooks after I got the 18.4's on it. The engine was damn stout.

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ChadS

05-12-2007 20:15:21

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Re: Timing on M in reply to turbos10, 05-12-2007 14:12:05

Here's what Id do, Add a MSD box, and a timing control unit. You can advance, or retard the timing manually 30 degrees either direction. Im with Dave on it may be too much to idle, and you need alot of timing as much as you can under power, but I dont thinkthe M dizzy will get you there. Any of the M dizzys Ive torn apart, VS the H dizzy, the H dizzy has a longer elongated slot where the tab sits on the advance as a stop. You can also grind about half the tab off and pick up some extra degrees upon the weights activating. If you have a deadman throttle, you can put the MSD dial right on the handle and control it upon revving it up on the line. Dyno tune it, and find out where the timing needs to be and mark it. Talked to a fella has a turbo M also, 4 inch bore, 8060 head, 10 psi of boost on the dyno made 119 hp. You know how big of stroker youd have to build to get that hp? Chad

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turbos10

05-12-2007 20:46:03

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Re: Timing on M in reply to ChadS, 05-12-2007 20:15:21

Thanks for the input guys. I am actually not sure which notch is TDC on #1. There are two marks about 1/2 inch apart when #1 is at TDC. Without pulling the cover I can not verify, but I expect there is one for initial timing and one for full advance. I guess I need to know if anyone has seen this and what the value is for each mark.

I actually already have a box, electronic conversion and MSD coil. In a turbo engine setting to maximum advance works pretty well for something like a puller. It has to be retarded as boost goes up so if you set for max boost it works out well. By doing this timing is fast at idle for response and a little slow in mid RPM to increase EGT and boost quickly.

My engine is not really your run of the mill engine; it will be turning close to 5KRPM at 20+psi if all goes as planned. It is a 4.25 bore, girdle, studs, arias pistons, two disc slipper with steel flywheel. I plan to come out of the hole at around 3500RPM, and it pulls in 4th gear. I hope to add more gear later to get the tire speed up.

Sounds pretty good with the big Holset and 4 inch pipe :). Cant wait to hook her to a sled!

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ChadS

05-13-2007 08:08:12

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Re: Timing on M in reply to turbos10, 05-12-2007 20:46:03

I was thinking the first notch is TDC, and the second notch is where the timing is set by the dizzy. Not too sure on what degree those marks are exactly though,, Im glad to hear you have gone the extra mile on the flywheel! Safety is always an issue. If you was to dyno it, use the direct drive side of the pto dyno, will let you run the higher rpms and still get a feel for whats going on. Id love to dyno that tractor! Id bet it would be over 125 hp at stock rpms, even more at the higher rpms and more boost. Try the timing control feature,,,, JMHO,, It can eliminate alot of guess work, and you dont have to do much to the stock dizzy to get where you need it to be. I know on my stroker H, it helped dial in the timing, and let me know where to make custom adjustments to the dizzy to get it to run without the timing control. Im sure you will get it ironed out very soon though. Chad

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turbos10

05-13-2007 12:58:50

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Re: Timing on M in reply to ChadS, 05-13-2007 08:08:12

I would like to dyno the tractor, but I would have to pull the rear plate and put the PTO back in it unless there is some way to do a wheel dyno. Crank HP on the engine should be close to 500 from what I can calculate. HP is just a function of torque which is a function of VE....those online calculators get pretty close to potential if you know how to use them.

Safety is definately a must plus the clutch setup will last forever in comparison to a standard button clutch. The flywheel is also 30 or 40lb lighter. I am still putting some connectors with a scatter plate in case the crank breaks and sends the flywheel spinning out of control.

I will use the previously mentioned measurements to figure the advance trusting the first mark is TDC.

Thanks,

Chris

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D Slater

05-12-2007 18:25:31

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Re: Timing on M in reply to turbos10, 05-12-2007 14:12:05

If standing in front of engine and looking to rear of tractor at the pulley measure around circumference of pulley in clockwise dirrection from TDC notch. 1 and 9/32 for 20 degrees, 1 and 11/32 for 25 degrees.That will put you pretty close. If you have or are using a distributor with original advance it will have 40 degrees advance in it if advance is working. If so and you set max advance to 20 by turning distributor I think it will be hard to get engine to idle. Advance and distributors got changed over the years so its hard to say what you have. Some got changed to less maxamum advance when fire crator kits were installed. Think you should work on advance in distributor and limit advance to the max you want unless you want timing to be retarded at low engine RPM.

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