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Search: Posts Made By: DaveMcLain
Forum: Engine Tech   06-21-2016, 09:33 AM
Replies: 19
Views: 1,171
Posted By DaveMcLain
I would certainly give it a try if the piston...

I would certainly give it a try if the piston checks out. If it doesn't you can get a single piston for not a whole lot of money anyway.
Forum: Engine Tech   06-21-2016, 07:48 AM
Replies: 19
Views: 1,171
Posted By DaveMcLain
I would say that if it didn't crack the piston...

I would say that if it didn't crack the piston when it did that it will probably work. Good thing you found the jammed ring but I would still mic the skirt just to make sure it didn't collapse the...
Forum: Engine Tech   06-20-2016, 12:57 PM
Replies: 19
Views: 1,171
Posted By DaveMcLain
It would be a good idea to check for a bent rod,...

It would be a good idea to check for a bent rod, collapsed piston skirt and jammed rings on that cylinder in particular.
Forum: Engine Tech   06-13-2016, 08:46 AM
Replies: 17
Views: 691
Posted By DaveMcLain
This sounds like a flat cam lobe to me. You'll...

This sounds like a flat cam lobe to me. You'll know when you take it apart.
Forum: Engine Tech   06-06-2016, 08:07 PM
Replies: 2
Views: 194
Posted By DaveMcLain
Some cars like turbo charged Corvair I believe...

Some cars like turbo charged Corvair I believe used a vacuum advance that could also retard under boost. Really though if the engine is built properly for the amount of boost and the available fuel...
Forum: Engine Tech   06-04-2016, 08:45 AM
Replies: 15
Views: 564
Posted By DaveMcLain
A good test that we used to do in the shop was to...

A good test that we used to do in the shop was to take an analog volt meter and place it across the battery terminals. Have someone crank the engine and get a reading of how much the battery voltage...
Forum: Engine Tech   06-03-2016, 06:31 PM
Replies: 5
Views: 297
Posted By DaveMcLain
I think something like that is a great idea.

I think something like that is a great idea.
Forum: Engine Tech   06-03-2016, 08:43 AM
Replies: 15
Views: 564
Posted By DaveMcLain
I'd check for a bad ground at the block as the...

I'd check for a bad ground at the block as the first thing. That would certainly make the voltage that you see at the coil low even while on resistor bypass.
Forum: Engine Tech   06-03-2016, 07:53 AM
Replies: 5
Views: 297
Posted By DaveMcLain
I don't feel that you necessarily need anything...

I don't feel that you necessarily need anything fancy for that sort of engine. What I've done in quite a few applications including jet boat is to make a baffle about 2 inches wide and weld it...
Forum: Engine Tech   05-28-2016, 04:34 PM
Replies: 5
Views: 296
Posted By DaveMcLain
You have to remember too that the secondary...

You have to remember too that the secondary portion of the ignition system is high impedance so a few hundred ohms resistance is inconsequential one way or the other and as Randy said it serves as a...
Forum: Engine Tech   05-27-2016, 08:46 AM
Replies: 16
Views: 800
Posted By DaveMcLain
Hopefully they are better than their SS series. ...

Hopefully they are better than their SS series. I had an 850 in that series come through here a few years ago and it was absolutely the most poorly calibrated out of the box carburetor ever,...
Forum: Engine Tech   05-17-2016, 09:49 AM
Replies: 5
Views: 406
Posted By DaveMcLain
On my monster truck customer's engines we've...

On my monster truck customer's engines we've always used the Boss length snout with a neutral balance small block Ford blower hub that I shortened so that its back side would just clear the seal when...
Forum: Engine Tech   04-24-2016, 07:15 PM
Replies: 7
Views: 474
Posted By DaveMcLain
I never use a drill to pre lube the engine I just...

I never use a drill to pre lube the engine I just use a 1/4 drive speed handle and a 5/16 socket which I turn by hand. You don't have to turn it very quickly to have plenty of pressure for pre...
Forum: Engine Tech   04-19-2016, 03:16 PM
Replies: 38
Views: 2,479
Posted By DaveMcLain
I think another interesting test would be to...

I think another interesting test would be to compare the partial squish Boss 429 design to a set of the same heads but modified for a fully open true hemi configuration.
Forum: Engine Tech   04-13-2016, 06:43 PM
Replies: 2
Views: 237
Posted By DaveMcLain
5/16

5/16
Forum: Engine Tech   04-13-2016, 06:55 AM
Replies: 26
Views: 1,717
Posted By DaveMcLain
Wow, I thought that Ford Racing or whatever they...

Wow, I thought that Ford Racing or whatever they call it now was pretty much universal world wide. I know that they used to be weird about only selling through a Motorsports dealer vs any Ford...
Forum: Engine Tech   04-12-2016, 06:40 AM
Replies: 26
Views: 1,717
Posted By DaveMcLain
That's a regular production block that someone...

That's a regular production block that someone modified with a set of caps from an A-460 block.
Forum: Engine Tech   04-11-2016, 04:06 PM
Replies: 3
Views: 296
Posted By DaveMcLain
Harland Sharp makes an aluminum roller rocker...

Harland Sharp makes an aluminum roller rocker that is a pedestal bolt down style with adjustment. Scorpion also makes one that bolts down like stock but with no adjuster.
Forum: Engine Tech   04-10-2016, 07:29 PM
Replies: 3
Views: 352
Posted By DaveMcLain
I've seen it caused by a cam core with a snout...

I've seen it caused by a cam core with a snout that was too long and bottoming against the washer instead of tightening up against the gear as it should. Two pins are only needed when you have a...
Forum: Engine Tech   04-07-2016, 08:58 AM
Replies: 9
Views: 690
Posted By DaveMcLain
I've seen that many times where putting in more...

I've seen that many times where putting in more timing hurts torque and horsepower and these are situations where the added timing isn't causing any other problems like detonation either.
...
Forum: Engine Tech   04-05-2016, 03:23 PM
Replies: 9
Views: 690
Posted By DaveMcLain
That's a nice amount to gain. Where did you find...

That's a nice amount to gain. Where did you find the most power? Optimizing timing? Carburetor spacers, jetting, headers or lash?
Forum: Engine Tech   04-03-2016, 05:20 PM
Replies: 7
Views: 451
Posted By DaveMcLain
The reason they are far too small for an engine...

The reason they are far too small for an engine of this size is because each cylinder can only "see" one throttle bore whereas a carburetor on a plenum allows each cylinder to see the entire...
Forum: Engine Tech   03-23-2016, 11:08 AM
Replies: 22
Views: 1,218
Posted By DaveMcLain
That's right, you're wrong and I'm correct. This...

That's right, you're wrong and I'm correct. This was discussed at great length years ago on this forum and your information is fallacy.
Forum: Engine Tech   03-22-2016, 03:17 PM
Replies: 22
Views: 1,218
Posted By DaveMcLain
Sorry, not true. The factory rods when they...

Sorry, not true. The factory rods when they break nearly always break in the beam and very rarely break through the big end no matter what style of bolt.
Forum: Engine Tech   03-21-2016, 05:11 PM
Replies: 17
Views: 1,153
Posted By DaveMcLain
Spun rod or two and the piston is coming up and...

Spun rod or two and the piston is coming up and hitting the head??
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