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Search: Posts Made By: DaveMcLain
Forum: Engine Tech 07-27-2015, 02:13 PM
Replies: 11
Views: 323
Posted By DaveMcLain
Back at the very first Big Ford Bash Wes...

Back at the very first Big Ford Bash Wes Littrell's cousin Shannon came there with a '62 Ford pickup that ran 6.60 at 100mph in the 1/8th. It was a flat piston .030 over 460(KB-137) with a set of...
Forum: Engine Tech 07-25-2015, 04:09 PM
Replies: 1
Views: 87
Posted By DaveMcLain
I would inspect the rockers and their trunions to...

I would inspect the rockers and their trunions to see what they look like. Usually you'll see some wear but that generally doesn't hurt anything and re using them is fine. On the pushrods the end...
Forum: Engine Tech 07-23-2015, 09:38 AM
Replies: 19
Views: 742
Posted By DaveMcLain
Another thing to check is to see if the timing...

Another thing to check is to see if the timing gear allows the snout of the cam to stick all the way though and bottom out on the back of the washer. If it does it will break the pin every time. I...
Forum: Engine Tech 07-21-2015, 09:16 AM
Replies: 20
Views: 721
Posted By DaveMcLain
What I've found interesting when using a wideband...

What I've found interesting when using a wideband is how tolerant the engine is to being too rich. It can be 2 ratios or more too rich for the conditions yet it seems to act just fine. Yet if you...
Forum: Engine Tech 07-17-2015, 10:10 AM
Replies: 4
Views: 183
Posted By DaveMcLain
Another option would be to use the KB 138 pistons...

Another option would be to use the KB 138 pistons along with your D3VE heads. This will give about 8.5:1 compression and work well with a cam of about 205 at .050 duration. That's what's in the 460...
Forum: Engine Tech 07-13-2015, 05:46 PM
Replies: 4
Views: 235
Posted By DaveMcLain
The reason it can have less that zero degrees of...

The reason it can have less that zero degrees of overlap at a given lift is because there isn't enough duration to cause both valve to be open to the given lift at the same time on the chosen lobe...
Forum: Engine Tech 07-13-2015, 02:32 PM
Replies: 2
Views: 119
Posted By DaveMcLain
It doesn't seem possible but could the propane...

It doesn't seem possible but could the propane adapter be restrictive enough that it messes with the bowl venting once the secondaries open? It would be pretty easy to hook a vacuum gauge to the...
Forum: Engine Tech 07-12-2015, 08:23 AM
Replies: 12
Views: 472
Posted By DaveMcLain
New lifters on an old cam is still risky but you...

New lifters on an old cam is still risky but you have to do what you have to do....

For what its worth, if you have a flat tappet cam and lifters that you take out of the engine and that you...
Forum: Engine Tech 07-09-2015, 04:59 PM
Replies: 43
Views: 2,154
Posted By DaveMcLain
Why would NHRA recognize any of these runs since...

Why would NHRA recognize any of these runs since they happened in match race not Pro Stock legal trim? How light could they have made the car? 2000lbs? Even at that weight the engine would have to...
Forum: Engine Tech 07-08-2015, 11:00 AM
Replies: 43
Views: 2,154
Posted By DaveMcLain
I can't remember where I found that picture...

I can't remember where I found that picture anymore. My understanding of the X pushrod engine was that it needed a special cam core with the lifters in a different order to work is that correct? To...
Forum: Engine Tech 07-07-2015, 10:18 AM
Replies: 43
Views: 2,154
Posted By DaveMcLain
That stuff is really interesting if even just to...

That stuff is really interesting if even just to see and to imagine what the factory guys might have been thinking. It seems too like Ford made so much experimental hardware for the 351C and Boss...
Forum: Engine Tech 07-07-2015, 08:44 AM
Replies: 43
Views: 2,154
Posted By DaveMcLain
I don't think this Cleveland is the one with the...

I don't think this Cleveland is the one with the pushrods in an X but it is still somewhat weird looking:


http://i40.photobucket.com/albums/e218/DaveMcLain/14_12_zpswpiuwoml.jpg
Forum: Engine Tech 07-06-2015, 12:19 PM
Replies: 43
Views: 2,154
Posted By DaveMcLain
That's weird, I was told that the first engine to...

That's weird, I was told that the first engine to break into the 7's was the aluminum big block with the aluminum CJ heads.
Forum: Engine Tech 07-04-2015, 08:08 PM
Replies: 4
Views: 205
Posted By DaveMcLain
What are you doing with the engine? WOT for long...

What are you doing with the engine? WOT for long periods? Street running? Drag racing? Most of the time for short duration running you don't want a particularly cold plug.
Forum: Engine Tech 07-04-2015, 08:04 PM
Replies: 6
Views: 332
Posted By DaveMcLain
Lowering the rocker ratio isn't going to gain you...

Lowering the rocker ratio isn't going to gain you all that much valve to piston clearance. Let's just say that the cam lift at TDC is .250. .250 X 1.73 = .432 lift. .250 X 1.5 = .375. That's a...
Forum: Engine Tech 07-03-2015, 09:05 AM
Replies: 10
Views: 398
Posted By DaveMcLain
I think that on the actual Detroit Diesel...

I think that on the actual Detroit Diesel application that the blowers on the 53 series engines had non twisted rotors. I think that the reason for the twist which certainly makes them much more...
Forum: Engine Tech 07-02-2015, 10:15 AM
Replies: 10
Views: 398
Posted By DaveMcLain
At first it looks like the whole thing would be...

At first it looks like the whole thing would be the discharge point until you really think about it for minute. As the rotors turn in the case the are exposed to atmospheric pressure at the top. ...
Forum: Engine Tech 07-02-2015, 09:26 AM
Replies: 10
Views: 398
Posted By DaveMcLain
I don't think it'll make much difference. Having...

I don't think it'll make much difference. Having the plenum will make it get even taller which might be a problem. I do think that you need some plenum to help sort out the fuel distribution...
Forum: Engine Tech 07-02-2015, 06:37 AM
Replies: 7
Views: 234
Posted By DaveMcLain
Looking at the pictures it seems like you might...

Looking at the pictures it seems like you might have a big belt/small belt pulley combo and that isn't going to work. It looks like a small belt pulley on the alternator and big ones on the other...
Forum: Engine Tech 07-01-2015, 11:05 AM
Replies: 7
Views: 352
Posted By DaveMcLain
They should be fine.

They should be fine.
Forum: Engine Tech 06-30-2015, 01:15 PM
Replies: 10
Views: 463
Posted By DaveMcLain
I have cams ground by Steve Demos, Demos' Cams...

I have cams ground by Steve Demos, Demos' Cams and the last regrind he did for me was for a Chevy small block marine engine with a factory hydraulic roller core, $140. Some cost more or less...
Forum: Engine Tech 06-30-2015, 09:04 AM
Replies: 10
Views: 463
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: 10
Views: 463
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: 3,153
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: 3,153
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...
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