Rear Engine Modified Roadster Build

Started by maguromic, February 23, 2009, 08:33:56 PM

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Cajun Kid

#285
March 16, 2011, 07:06:49 PM
Tony,,, wow that mid plate is art work !!!

Charles
ECTA Record Holder Maxton
E/CBFALT, E/CBGALT, E/CGALT, E/CFALT, A/CGALT, C/CGALT, D/CGALT, C/CBGALT, B/CBGALT, C/CFALT
OHIO
B/CGALT, C/CGALT

LTA Record Holder and 200 Club Member
A/CBFALT, B/CBFALT, C/CBFALT, C/CFALT, C/CGALT,   E/CGALT, E/CFALT

Fastest Standing Mile at Ohio  203.343mph
Fastest Standing Mile at Maxton 196.967mph
Fastest Standing 1.5 Mile at Loring 213.624mph
Fastest Standing Mile at Loring 204.109mph

http://s261.photobucket.com/albums/ii43/cajunkid5690/

Blog    www.venablerodsandracing.com
email   venableracing@gmail.com

Peter Jack

#286
March 16, 2011, 07:35:14 PM
Looks to me like the whole car is going to have a rather large WOW factor! :cheers: :cheers: :cheers:

Pete

maguromic

#287
March 16, 2011, 08:50:54 PM
Charles and Pete, thanks for the compliments!!!  :cheers: Its off to the plating shop later in the week for a clear anodize.  Tony
"If you haven't seen the future, you are not going fast enough"

bvillercr

#288
March 16, 2011, 09:14:07 PM
Quote from: Peter Jack on March 16, 2011, 07:35:14 PM
Looks to me like the whole car is going to have a rather large WOW factor! :cheers: :cheers: :cheers:

Pete

Yes, I would agree.  Your collection of avatars are work of art as well!  Happy Saint Patricks day to you too! :-o

Tman

#289
March 16, 2011, 09:24:16 PM
Quote from: maguromic on March 16, 2011, 08:50:54 PM
Charles and Pete, thanks for the compliments!!!  :cheers: Its off to the plating shop later in the week for a clear anodize.  Tony

You answered my question before I asked it, nice work guys!

maguromic

#290
March 17, 2011, 03:24:40 PM
Yesterday Kevin sent over some pictures of the rear uprights in progress. If they turnout half as nice as his Cadillac heads I know these will be perfect. I cant believe all the lines of code for these. :-o Tony


"If you haven't seen the future, you are not going fast enough"

maguromic

#291
April 03, 2011, 09:38:59 PM
These are some more shots of the reverse side of the uprights being machined.  Hopefully they should be done by the end of the week. Tony


"If you haven't seen the future, you are not going fast enough"

maguromic

#292
April 16, 2011, 05:51:34 PM
Finally the rear uprights are done, they will mate to modified Chevy Malibu hubs.  Tony
"If you haven't seen the future, you are not going fast enough"

38flattie

#293
April 16, 2011, 05:56:46 PM
The number of lines of code always amazes me! I always think that because the part is small, the code should be simple.

That's looking real good, Tony!

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

maguromic

#294
April 17, 2011, 08:16:43 PM
Quote from: 38flattie on April 16, 2011, 05:56:46 PM
The number of lines of code always amazes me! I always think that because the part is small, the code should be simple.

That's looking real good, Tony!



Thanks Buddy!   The upright has a little over a 1000 lines of code and the other side is exactly opposite with another 1000 lines of code. Tony
"If you haven't seen the future, you are not going fast enough"

Freud

#295
April 18, 2011, 08:26:18 AM
Now I get to enjoy another build diary.

THANX

FREUD
Since '63

38flattie

#296
May 01, 2011, 10:38:47 AM Last Edit: May 01, 2011, 01:54:50 PM by 38flattie
I talked with Sparky today, about a Jimmy 302 for my coupe. This thread was brought up, so I decided to read the whole thing again.

Now my head hurts! Lol!  :-D

There is sooo much good info here, and an amazing build. :cheers:

Can I ask you a couple of questions? Why the cast girdle, instead of a machined one?

Can you expand on the lifter setup, or is that "IP"?

Can you give any details of the head? I just made a deal on a Skinner head.

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

maguromic

#297
May 01, 2011, 03:13:05 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) and the sheer size of the part to machine from a billet was too much.  The girdle has three extra mains and three extra cam supports to help with stability (because of our bigger base circle we are using 460 Ford cam bearings).  We also went with Dodge 318 main bearings to uniform everything and moved the thrust bearing to the back.  The big draw back I see is that the two metals will expand at different temperatures throwing the bearing tolerances off.  For this we came up with a starting procedure to get the tolerances we built to.

There's no IP involved with the lifter. Its an idea that and Kay Sissell and Mike Kirby came up with a long time ago and something I expanded on  with the help of Terry Manton to help valve train stability.   Due to the long push rods on the GMC, if your going to run any sort of serious lift the push rods will have odd angles and will be reflected in performance. The small lifter in the head fixes this problem and in our case we are running almost a 1" of lift and needed this to take the angle from the head to the rocker arm (I think I have about three sets left).

The other area you want to look at is the rocker arm attachment. In our spintron runs at high RPM the rocker arms tended to wobble around a bit.  To fix the problem we came with a girdle for the rocker arm, which also acts as the bottom of the valve cover. It attaches each rocker with two bolts.

The head you have is very nice head and would be a great XXO motor.  In our case we are going with a stock head for both XO and XXO, with the XXO running more CI than the 325 allowed for a 12 port.  I don't want to get into specific valve sizes and flow numbers, but I say it can run with the best of the 12 port heads.

The one thing we did from the start of the build was to see how we could optimize everything.  I was very fortunate from the start that a lot of good people was open with help on the GMC, the Ferguson's, Doug Robinson, Armond and Mike Kirby just to name a few.

Now that you are thinking of turning to the dark side, have fun with it and ask away with any questions you have. There is a lot of GMC knowledge on the boards. Tony
"If you haven't seen the future, you are not going fast enough"

38flattie

#298
May 01, 2011, 03:27:32 PM Last Edit: May 01, 2011, 03:30:54 PM by 38flattie
Thanks Tony!


The big draw back I see is that the two metals will expand at different temperatures throwing the bearing tolerances off

That's why I was asking. I thought a milled steel girdel might be a more 'natural' fit. Sounds like you have it handled though. :cheers:

So I assume that there is a short pushrod to the lifter in the head, then another from the lifter to the rocker, or does the head' lifter contact the rocker ? What holds the lifter in the head-a milled pocket?

Hmmm, if I had known a stock head could be made to flow as well as a Skinner, I probably would have kept my money in my pocket! :-D


Joe Fontana thinks 1000-1100HP on fuel is realistic. We're gonna see!
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

38flattie

#299
May 01, 2011, 04:02:18 PM
Quote from: maguromic on May 09, 2009, 09:50:44 PM
Did some work on the parts today and also decided that we will use my my blown GMC 6 first.  It has a F2 reverse rotation Procharger that was taken apart today and sent out to get extrude honed.  The drawing is to scale with the aftercooler and the air box. However I still have to do some CFD work on the air box to see how it will flow.  Tony

   

Oh yea, I forgot to ask if you could provide any details on your air box?
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
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