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Search: Posts Made By: DaveMcLain
Forum: Engine Tech 06-30-2015, 09:04 AM
Replies: 8
Views: 244
Posted By DaveMcLain
The way cams work for the most part is that...

The way cams work for the most part is that irregardless of the amount of lift that a camshaft has the lifter tends to be at or very near the same position in the bore at maximum lift. In order to...
Forum: Engine Tech 06-29-2015, 06:28 PM
Replies: 8
Views: 244
Posted By DaveMcLain
Generally speaking it is a lot easier and safer...

Generally speaking it is a lot easier and safer to grind a cam to be larger(greater duration and lift) rather than smaller.
Forum: Engine Tech 06-24-2015, 03:39 PM
Replies: 47
Views: 2,928
Posted By DaveMcLain
I don't think that anything matters except for...

I don't think that anything matters except for the centerline of the pin because that's where the movement is also centered. In an ideal world I think it would be better if the cylinder was longer...
Forum: Engine Tech 06-24-2015, 01:15 PM
Replies: 47
Views: 2,928
Posted By DaveMcLain
It is very easy to figure out how far the wrist...

It is very easy to figure out how far the wrist pin centerline is away from the crank centerline at BDC. Take 1/2 the stroke and subtract that number from the length of the connecting rod. In this...
Forum: Engine Tech 06-24-2015, 12:25 PM
Replies: 47
Views: 2,928
Posted By DaveMcLain
No, I'm not talking about compression height I'm...

No, I'm not talking about compression height I'm talking about where the wrist pin centerline stops at BDC. Making the compression height taller does NOT make the piston more stable in the bore in...
Forum: Engine Tech 06-24-2015, 09:01 AM
Replies: 11
Views: 520
Posted By DaveMcLain
That's one of the really nice advantages to using...

That's one of the really nice advantages to using a hypereutectic or any high silicon alloy piston is that by having less expansion it allows the piston and rings to function more optimally over a...
Forum: Engine Tech 06-24-2015, 07:50 AM
Replies: 6
Views: 311
Posted By DaveMcLain
If you have the heads apart, hot tanked and at a...

If you have the heads apart, hot tanked and at a shop for a valve job it would probably be best to just spend a little more and put in the hard seats. With that said I would say that you probably...
Forum: Engine Tech 06-23-2015, 09:49 AM
Replies: 11
Views: 520
Posted By DaveMcLain
I don't generally find that to be true. A cooler...

I don't generally find that to be true. A cooler intake manifold yes, a cooler engine no.
Forum: Engine Tech 06-23-2015, 06:37 AM
Replies: 6
Views: 311
Posted By DaveMcLain
Very generally speaking if you have an old...

Very generally speaking if you have an old engine/set of heads that have been run for a long time using leaded fuel and you suddenly switch to unleaded the seats will often survive just fine for many...
Forum: Engine Tech 06-22-2015, 04:38 PM
Replies: 8
Views: 342
Posted By DaveMcLain
That sort of valvetrain will also have pretty...

That sort of valvetrain will also have pretty strict mechanical limits but they will be different than a cam driven valvetrain. It should allow the cam to be more optimum under a variety of...
Forum: Engine Tech 06-17-2015, 07:24 AM
Replies: 17
Views: 669
Posted By DaveMcLain
If you look at your balancing information does it...

If you look at your balancing information does it state what hardware should be used with the assembly? Does it say use neutral balance hardware or to use external balance hardware or something in...
Forum: Events 06-15-2015, 04:05 PM
Replies: 19
Views: 957
Posted By DaveMcLain
Cool thanks for sharing your videos. I'm glad...

Cool thanks for sharing your videos. I'm glad you got one of Wes' twin engine "creation" too.
Forum: Events 06-12-2015, 06:22 PM
Replies: 19
Views: 957
Posted By DaveMcLain
This is happening right now does anybody have any...

This is happening right now does anybody have any pictures or videos to share?
Forum: Engine Tech 06-12-2015, 06:16 PM
Replies: 31
Views: 1,787
Posted By DaveMcLain
How come no truck engines ever used the four bolt...

How come no truck engines ever used the four bolt block if it was such a necessity for durability?
Forum: Engine Tech 06-12-2015, 03:14 PM
Replies: 47
Views: 2,928
Posted By DaveMcLain
What's interesting about this is how the...

What's interesting about this is how the difference in the pin centerline position is only .360 between a stock stroke, stock rod 429 and a 6.700 rod 4.500 stroke engine. It seems like it would be...
Forum: Engine Tech 06-12-2015, 12:29 PM
Replies: 31
Views: 1,787
Posted By DaveMcLain
No, I say they did it for marketing reasons most...

No, I say they did it for marketing reasons most likely.
Forum: Engine Tech 06-11-2015, 10:28 AM
Replies: 3
Views: 204
Posted By DaveMcLain
I would say that it could be that the carburetor...

I would say that it could be that the carburetor could have something in an idle feed restriction(also feeds the transition slot) and this is making it lean enough when it is tipped in to make it...
Forum: Engine Tech 06-09-2015, 09:13 AM
Replies: 24
Views: 1,556
Posted By DaveMcLain
Have you ever tested various size carburetors on...

Have you ever tested various size carburetors on a given engine? It is amazing how much of a change it takes to really make much of a difference in peak horsepower numbers. Recently I ran a 545...
Forum: Engine Tech 06-08-2015, 09:43 AM
Replies: 24
Views: 1,556
Posted By DaveMcLain
No I'd say it's because most people don't really...

No I'd say it's because most people don't really understand carburetor sizing and its effects on horsepower and engine response.
Forum: Engine Tech 06-08-2015, 09:02 AM
Replies: 24
Views: 1,556
Posted By DaveMcLain
Really? Why would that size carburetor be a...

Really? Why would that size carburetor be a problem?
Forum: Engine Tech 06-07-2015, 06:49 AM
Replies: 49
Views: 2,085
Posted By DaveMcLain
A long time ago we used to have one of these that...

A long time ago we used to have one of these that came into our shop from time to time and I think it was about the same color as the one in your picture. I was an old car that was pretty ratty but...
Forum: Engine Tech 06-05-2015, 09:12 AM
Replies: 3
Views: 418
Posted By DaveMcLain
I don't think it stands for "Scat" I think it...

I don't think it stands for "Scat" I think it probably stands for "Sunrey" which must be a foundry in China and is something I've seen on forgings from Eagle not Scat.
Forum: Engine Tech 06-03-2015, 03:35 PM
Replies: 17
Views: 547
Posted By DaveMcLain
I'd certainly give it a try. In my testing I...

I'd certainly give it a try. In my testing I measured the depression produced using a water manometer from my flow bench and it only pulled about 20 or so inches of water(1.5in Hg) dead headed or...
Forum: Engine Tech 06-03-2015, 10:15 AM
Replies: 17
Views: 547
Posted By DaveMcLain
I didn't have the system even hooked to the...

I didn't have the system even hooked to the engine so I was just measuring how strong of a depression it could create. I also tried the system with no check valves just to see if maybe they were...
Forum: Engine Tech 06-03-2015, 09:55 AM
Replies: 17
Views: 547
Posted By DaveMcLain
No but it does seem like there would be more...

No but it does seem like there would be more flow(cfm) with an increase in RPM. If the density of the exhaust was really causing the effect it seems like it would make it produce the greatest...
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