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Author Topic: Rear Engine Modified Roadster Build  (Read 290958 times)

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Offline maguromic

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Re: Rear Engine Modified Roadster Build
« Reply #300 on: May 01, 2011, 08:13:30 PM »
There are two push rods, one long and one small one about 3” long from the lifter to the rocker.  The lifter fits into a guide (diesel valve guide) pressed into the head.  

The head is another story.  We have over two years on the flow bench and I can’t even count how many heads we cut up to get to this stage.  

Joe Fontana is absolutely correct on the HP number.  He has seen the same engine I saw that is going into a lakester trying for a 300 mph run :-o.  If it does what it did on the dyno it will be a beast.

The air box is built around the style of the Audi LMP engine (I think theirs worked somewhat  :-D).  We are trying to blow the air from the top down evenly across the box and build some pressure.  The throttle bodies are (height adjustable for tuning) duel barrel valve types that have no obstructions. Tony
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Offline 38flattie

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Re: Rear Engine Modified Roadster Build
« Reply #301 on: May 01, 2011, 08:34:30 PM »
Good stuff Tony, Thanks!
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With sufficient thrust, pigs fly just fine. However, this is not necessarily a good idea. It is hard to be sure where they are going to land, and it could be dangerous sitting under them as they fly overhead. -- RFC 1925

You can't make a race horse out of a pig. But if you work hard enough at it you can make a mighty fast pig. - Bob Akin

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Offline Rick Byrnes

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Re: Rear Engine Modified Roadster Build
« Reply #302 on: May 01, 2011, 10:58:01 PM »
Buddy, The reason I went with the cast aluminum girdle was that the pattern already existed (Doug Robinson was kind to loan it to me)

Girdles have been successful in both steel, and aluminum.  The Roush engines of the GTO cars in the 80's were 2.3L Pinto based and used billet aluminum girdles.  I do not know the alloy.  The 2.5L displacement engines were extremely successful and NEVER had a structure failure that I know of.  Reportedly with unrestricted turbochargers could make in the vicinity of 1000 HP.
They won a lot.

Bi-metal joints down low should be around oil temperatures and shouldn't have too much movement in shear which is where the weakness would be.

OH, Tony, where DO you get those avitar photos.  Man they just keep on getting better.
« Last Edit: May 01, 2011, 10:59:32 PM by Rick Byrnes »
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Offline maguromic

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Re: Rear Engine Modified Roadster Build
« Reply #303 on: May 02, 2011, 01:25:08 AM »
I did forget to add that when I told the foundry what I was doing with it, the metallurgist did change the cocktail a bit to make it more durable.  In my opinion the cylinder flex is a bigger problem which we are dealing with now with an old school fix. Boy, working with the old iron keeps the brain cells working.

Rick, All the pictures are from various racetracks, not all mine though.  Tony
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Offline Saltfever

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Re: Rear Engine Modified Roadster Build
« Reply #304 on: May 02, 2011, 02:11:46 AM »
Yeah, I had to zoom my browser to 400% just to see the name of her designer.  :wink:
« Last Edit: May 02, 2011, 02:40:09 AM by Saltfever »
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Offline 38flattie

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Re: Rear Engine Modified Roadster Build
« Reply #305 on: May 02, 2011, 07:31:46 AM »
Quote from: Rick Byrnes on May 01, 2011, 10:58:01 PM

Bi-metal joints down low should be around oil temperatures and shouldn't have too much movement in shear which is where the weakness would be.


Very good point, and I didn't take that into consideration.

Tony, I thought we had done some design work, but we are ages behind you guys! Kudos! :cheers:
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With sufficient thrust, pigs fly just fine. However, this is not necessarily a good idea. It is hard to be sure where they are going to land, and it could be dangerous sitting under them as they fly overhead. -- RFC 1925

You can't make a race horse out of a pig. But if you work hard enough at it you can make a mighty fast pig. - Bob Akin

http://www.flatcadracing.org/
http://youtu.be/89rVb497_4c

Offline WOODY@DDLLC

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Re: Rear Engine Modified Roadster Build
« Reply #306 on: May 02, 2011, 09:49:21 AM »
Quote from: Saltfever on May 02, 2011, 02:11:46 AM
Yeah, I had to zoom my browser to 400% just to see the name of her designer.  :wink:

I looked at 800% and still could not see her cast aluminum girdle!  :-(
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Offline 38flattie

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Re: Rear Engine Modified Roadster Build
« Reply #307 on: May 03, 2011, 07:53:19 AM »
Tony, maybe I missed it, but I don't see what you are running for ignition?

Is Doug the only one with the 7 main bearing pattern, or are there other 7 main girdles out there?

Enquiring minds want to know! Lol!
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With sufficient thrust, pigs fly just fine. However, this is not necessarily a good idea. It is hard to be sure where they are going to land, and it could be dangerous sitting under them as they fly overhead. -- RFC 1925

You can't make a race horse out of a pig. But if you work hard enough at it you can make a mighty fast pig. - Bob Akin

http://www.flatcadracing.org/
http://youtu.be/89rVb497_4c

Offline maguromic

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Re: Rear Engine Modified Roadster Build
« Reply #308 on: May 03, 2011, 11:40:45 AM »
Buddy, We have not settled on an ignition system yet, but since we will be running fuel we are leaning towards a MSD Pro Mag 44.  Need the arc welder for the fuel. :-o

Years ago Don Ferguson showed me the girdle he was building.  Other than his, Doug’s and mine are the only ones I know of.  But that does not mean there aren’t any others out there.  Just look at all the 5 main Model A engines running.  There is more than one way to skin this cat.  At Armond’s (rebelce on the boards) suggestion we looked at modifying a Ford 300 7 main crank. With some modifying of the block and crank (not for the weak heart) it will work.  I was told the Ford 300 steel cranks came in heavy-duty trucks and wood chippers.  After an exhaustive search I gave up because I couldn’t find one of those cranks out here at a reasonable price. Tony
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Offline 38flattie

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Re: Rear Engine Modified Roadster Build
« Reply #309 on: May 03, 2011, 11:50:36 AM »
Good stuff! :cheers:

Is Don Ferguson's bottem end based of the same pattern, or a different one?

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With sufficient thrust, pigs fly just fine. However, this is not necessarily a good idea. It is hard to be sure where they are going to land, and it could be dangerous sitting under them as they fly overhead. -- RFC 1925

You can't make a race horse out of a pig. But if you work hard enough at it you can make a mighty fast pig. - Bob Akin

http://www.flatcadracing.org/
http://youtu.be/89rVb497_4c

Offline maguromic

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Re: Rear Engine Modified Roadster Build
« Reply #310 on: May 03, 2011, 01:58:11 PM »
I don't really like talking about bottom ends, its just too personal.  :-o

Though, Don did machine the one he showed me from billet.  The best thing to do is call him, he is one class act and will help you if he can.  Tony
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Offline 38flattie

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Re: Rear Engine Modified Roadster Build
« Reply #311 on: May 03, 2011, 02:38:33 PM »
Well, you may not like talking about them, bit you sure have a nice photo collection of them! I think that avatar is the best yet! :cheers:

I'll call Don. I talked to him about a cam blank yesterday, but didn't realize he had the 7 main set up.
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With sufficient thrust, pigs fly just fine. However, this is not necessarily a good idea. It is hard to be sure where they are going to land, and it could be dangerous sitting under them as they fly overhead. -- RFC 1925

You can't make a race horse out of a pig. But if you work hard enough at it you can make a mighty fast pig. - Bob Akin

http://www.flatcadracing.org/
http://youtu.be/89rVb497_4c

Offline Tman

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Re: Rear Engine Modified Roadster Build
« Reply #312 on: May 03, 2011, 03:51:59 PM »
Quote from: maguromic on May 03, 2011, 11:40:45 AM
Buddy, We have not settled on an ignition system yet, but since we will be running fuel we are leaning towards a MSD Pro Mag 44.  Need the arc welder for the fuel. :-o

Years ago Don Ferguson showed me the girdle he was building.  Other than his, Doug’s and mine are the only ones I know of.  But that does not mean there aren’t any others out there.  Just look at all the 5 main Model A engines running.  There is more than one way to skin this cat.  At Armond’s (rebelce on the boards) suggestion we looked at modifying a Ford 300 7 main crank. With some modifying of the block and crank (not for the weak heart) it will work.  I was told the Ford 300 steel cranks came in heavy-duty trucks and wood chippers.  After an exhaustive search I gave up because I couldn’t find one of those cranks out here at a reasonable price. Tony


Tony, those 300s are used in LOTS of industrial engines. We have several at the shop. Here is a resource if you need it. http://www.ford-trucks.com/forums/index.php
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Offline maguromic

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Re: Rear Engine Modified Roadster Build
« Reply #313 on: May 03, 2011, 04:18:08 PM »
Tman, Thanks for the link.  :cheers: But now we are married to the girdle.  Tony
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Offline Tman

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Re: Rear Engine Modified Roadster Build
« Reply #314 on: May 03, 2011, 06:29:25 PM »
Quote from: maguromic on May 03, 2011, 04:18:08 PM
Tman, Thanks for the link.  :cheers: But now we are married to the girdle.  Tony

Extra unessesary knowlege is always a good thing!
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