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Search: Posts Made By: DaveMcLain
Forum: Engine Tech 07-30-2014, 11:17 AM
Replies: 20
Views: 848
Posted By DaveMcLain
Keep in mind that if you're raising the...

Keep in mind that if you're raising the compression ratio you're also reducing the total volume in the engine. With forced induction it can be better for power to have lower compression and thus a...
Forum: Engine Tech 07-28-2014, 12:29 PM
Replies: 20
Views: 848
Posted By DaveMcLain
I don't know if a lot of drag strips will let you...

I don't know if a lot of drag strips will let you run that fast if you weigh that much but maybe that's ok if you're running the 1/8th.
Forum: Engine Tech 07-27-2014, 03:34 PM
Replies: 1
Views: 100
Posted By DaveMcLain
Check out the thread where the guy was having...

Check out the thread where the guy was having trouble with his jet boat engine. He thought it was a carburetor problem but it turned out to be a flat cam. You notice the problem more on gas because...
Forum: Engine Tech 07-26-2014, 10:45 AM
Replies: 20
Views: 848
Posted By DaveMcLain
I'm not convinced that it will gain much of...

I'm not convinced that it will gain much of anything but I guess it might be worth a try.
Forum: Engine Tech 07-25-2014, 08:04 PM
Replies: 9
Views: 342
Posted By DaveMcLain
That happens some times when you're running at...

That happens some times when you're running at very light load at higher than idle speeds with a cam that has a lot of exhaust duration. I doubt it'll hurt anything or that there is anything what so...
Forum: Engine Tech 07-25-2014, 11:17 AM
Replies: 46
Views: 1,688
Posted By DaveMcLain
I think they will work fine. That's about how...

I think they will work fine. That's about how much spring I have on engines that I've built for jet boat customers and they have the Comp Cams lifters. They just think of the lifters as consumables...
Forum: Engine Tech 07-24-2014, 08:18 PM
Replies: 4
Views: 222
Posted By DaveMcLain
Oh that's right its winter down there! A couple...

Oh that's right its winter down there! A couple of months ago we bored a brand new A460 block to 4.600 bore for a customer who had let his previous block freeze and crack over the winter what an...
Forum: Engine Tech 07-24-2014, 03:20 PM
Replies: 46
Views: 1,688
Posted By DaveMcLain
Now how do you know that nobody has done any of...

Now how do you know that nobody has done any of this sort of testing? I've run the Comp Cams lifters for years as well without issue BUT as I showed you in one of the pictures the older lifters are...
Forum: Engine Tech 07-22-2014, 03:08 PM
Replies: 46
Views: 1,688
Posted By DaveMcLain
I don't think you realize how much oil flow I'm...

I don't think you realize how much oil flow I'm talking about with this problem and this is with stone cold 20W-50 Valvoline oil what's it like when the oil is at 200 degrees vs about 75? Think...
Forum: Engine Tech 07-21-2014, 02:24 PM
Replies: 46
Views: 1,688
Posted By DaveMcLain
I didn't run the engine with this set of lifters...

I didn't run the engine with this set of lifters so I can't say exactly what it would have done to the oil pressure but these lifters were producing a gigantic leak. There were always at least a few...
Forum: Engine Tech 07-21-2014, 10:41 AM
Replies: 46
Views: 1,688
Posted By DaveMcLain
I dug up an old Competition Cams 836 lifter for...

I dug up an old Competition Cams 836 lifter for some comparison:

This is from a set that was made maybe 5-10 years ago but not before they added the EDM hole(this lifter has that feature). What's...
Forum: Engine Tech 07-21-2014, 10:15 AM
Replies: 8
Views: 353
Posted By DaveMcLain
Building the engine with sensible clearances is...

Building the engine with sensible clearances is the first priority. In a low application I'd shoot for .0015-.002 rods and mains.

The big Ford oiling system is adequate and not a problem. Your...
Forum: Engine Tech 07-21-2014, 10:04 AM
Replies: 46
Views: 1,688
Posted By DaveMcLain
The lifter in the picture(not taken by me) next...

The lifter in the picture(not taken by me) next to the Crower is not an 836 most likely but it is machined exactly the same where it counts and the oil hole which feeds the pushrod is not involved...
Forum: Engine Tech 07-21-2014, 10:02 AM
Replies: 53
Views: 1,500
Posted By DaveMcLain
That's great news! I'm glad to hear that you...

That's great news! I'm glad to hear that you have it running well once again.
Forum: Engine Tech 07-21-2014, 07:02 AM
Replies: 4
Views: 222
Posted By DaveMcLain
Look at the holes that are in the gasket, see how...

Look at the holes that are in the gasket, see how they compare size wise to the holes in the deck.
Forum: Engine Tech 07-20-2014, 07:28 PM
Replies: 46
Views: 1,688
Posted By DaveMcLain
The ones in my picture(lifters laying on the...

The ones in my picture(lifters laying on the block) are the Comp Cams 836 which are machined in the same way as the lifter body being compared to the Crower. It will be very interesting to see how...
Forum: Engine Tech 07-20-2014, 01:09 PM
Replies: 46
Views: 1,688
Posted By DaveMcLain
The cam having more or less lift shouldn't make a...

The cam having more or less lift shouldn't make a big difference with this problem because the lifter tends to stop at around the same place at max lift.
Forum: Engine Tech 07-20-2014, 10:44 AM
Replies: 46
Views: 1,688
Posted By DaveMcLain
A friend just so happened to have another copy of...

A friend just so happened to have another copy of that cam and it plotted and measured identically. It's only .387 lobe lift so that means that the base circle is big but that shouldn't effect...
Forum: Engine Tech 07-19-2014, 08:30 PM
Replies: 46
Views: 1,688
Posted By DaveMcLain
This engine was using a Comp Cams XR 286 cam, an...

This engine was using a Comp Cams XR 286 cam, an off the shelf grind that the customer supplied, standard base circle etc in a production DOVE-A block. The cutout for the roller is too high on those...
Forum: Engine Tech 07-18-2014, 08:01 PM
Replies: 46
Views: 1,688
Posted By DaveMcLain
Watch out with the Comp lifters because not long...

Watch out with the Comp lifters because not long ago I had a problem with them dumping oil pressure up near maximum lift in a production block. Search around on this forum and you can find my post...
Forum: Engine Tech 07-18-2014, 12:23 PM
Replies: 7
Views: 211
Posted By DaveMcLain
I tried using anaerobic sealant on copper head...

I tried using anaerobic sealant on copper head gaskets one time for my monster truck customer and it was a disaster. At first it was perfect but then over time it leaked worse and worse. Copper...
Forum: Engine Tech 07-15-2014, 12:22 PM
Replies: 6
Views: 250
Posted By DaveMcLain
If the 429 is in good shape use it; why not?

If the 429 is in good shape use it; why not?
Forum: Engine Tech 07-12-2014, 12:51 PM
Replies: 5
Views: 214
Posted By DaveMcLain
Since you know that your engine is basically...

Since you know that your engine is basically sound and just needing a freshening I would say that to pull it out and rebuild it would be the way to go because you'll be starting with a known...
Forum: Engine Tech 07-12-2014, 12:42 PM
Replies: 15
Views: 487
Posted By DaveMcLain
Why couldn't it be the exhaust? He says it just...

Why couldn't it be the exhaust? He says it just flattens out. I've run that same cam in a 545 on the dyno and it was peaking close to 6000rpm with a chassis header and a 3.5 inch collector into a...
Forum: Engine Tech 07-11-2014, 04:37 PM
Replies: 15
Views: 487
Posted By DaveMcLain
Maybe the exhaust system is more restrictive that...

Maybe the exhaust system is more restrictive that it appears. I've had engines make just a little over 600 horsepower on the dyno running a set of Pantera headers with a 2.5 inch collector followed...
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