Rear Engine Modified Roadster Build

[maguromic]

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 .  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  ).  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

[38flattie]

Good stuff Tony, Thanks!

[Rick Byrnes]

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.

[maguromic]

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

[Saltfever]

Yeah, I had to zoom my browser to 400% just to see the name of her designer.  

[38flattie]

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!

[WOODY@DDLLC]

Yeah, I had to zoom my browser to 400% just to see the name of her designer. 

I looked at 800% and still could not see her cast aluminum girdle! 

[38flattie]

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!

[maguromic]

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.

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

[38flattie]

Good stuff!

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

[maguromic]

I don't really like talking about bottom ends, its just too personal. 

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

[38flattie]

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!

I'll call Don. I talked to him about a cam blank yesterday, but didn't realize he had the 7 main set up.

[Tman]

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.

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

[maguromic]

Tman, Thanks for the link.  But now we are married to the girdle.  Tony

[Tman]

Tman, Thanks for the link.  But now we are married to the girdle.  Tony

Extra unessesary knowlege is always a good thing!