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9.70 at 135 – Edelbrock Heads, E85

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ramblermoosecocka View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote ramblermoosecocka Quote  Post ReplyReply Direct Link To This Post Posted: Oct/04/2017 at 2:19pm
Thanks.  The cam is a custom Harold Brookshire (Ultradyne, etc.) 28 deg piece, 259/267 at .050, cut on a 106 LSA, installed at 101.  Tight lash; .650 net lift.  Harold was adamant that the combo would ET best with 106/101, but I have not confirmed by trying anything else.  I have had experience with 3 engines that use this lobe series, and each ran faster than expected (only one install was cam only, however - the ET dropped 3 tenths in the 1/4 over the same combo with a Comp .420 cam in a consistent car.  Same LSA, same lift.).  Also, these lobes appear to be relatively easy on parts.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote SC397 Quote  Post ReplyReply Direct Link To This Post Posted: Oct/04/2017 at 2:35pm
Page 3 shows the Dyno Session (72. BradmobileII427)
http://rebsamcandjeep.proboards.com/thread/144/dyno-time?page=3
I will try to re-post the pictures.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote SC397 Quote  Post ReplyReply Direct Link To This Post Posted: Oct/04/2017 at 2:55pm
Page 14-15 tells a little bit about the engine build. His is listed as 72. BradmobileII427 on this forum.

http://rebsamcandjeep.proboards.com/thread/11/amc-engine-builds?page=14

The man the myth the legend.. LOL!
Bradfarmguy by Rick Jones, on Flickr
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ramblermoosecocka View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote ramblermoosecocka Quote  Post ReplyReply Direct Link To This Post Posted: Oct/04/2017 at 3:07pm
Here is the cylinder head flow data, from a conservative local bench that a number of us in SE MI have used.  MCSA of the intake port is 2.52 sq-in, so it is relatively large and slow (average velocity at .600 is 275 fps).  Maybe this is what E85 wants.  There is more liquid taking up space and adding charge momentum in the port, so big and slow may make it easier to make the turn to the valve.  This is all a guess however.  The Edelbrock's have a more modern chamber shape, and there may be other subtle port shape improvements over stock.  

BTW, 6.61 sec in the 1/8 converts to 10.40's in the 1/4.  At 3250#, a fast car by any standard.

0.100

67

53

0.200

137

111

0.300

198

157

0.400

246

191

0.500

281

213

0.600

289

227

0.700

293

237

0.800

296

243

 


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Post Options Post Options   Thanks (0) Thanks(0)   Quote pfordamx Quote  Post ReplyReply Direct Link To This Post Posted: Oct/04/2017 at 3:09pm
i thought harold had passed and i noticed bullet shows to now own ultradyne do you happen to know the lobe # used on this cam?
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ramblermoosecocka View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote ramblermoosecocka Quote  Post ReplyReply Direct Link To This Post Posted: Oct/04/2017 at 3:51pm
Regarding the camshaft duration, I have shifted as high as 7100, and the engine does not nose over.  But there is no ET advantage to shifting there over the 67-6800 that I settled on, where it seems to be pulling a little harder.  An educated guess is that peak HP is around 6600, based on feel and on comparison to the cam the engine was dyno'd with.  RPM range seems to be a reasonable match to the gear ratio and torque converter, etc.
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ramblermoosecocka View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote ramblermoosecocka Quote  Post ReplyReply Direct Link To This Post Posted: Oct/04/2017 at 4:42pm
Yes, Harold is deceased, unfortunately.  Generous, talented, and hard-working man.  But before he became that way, he spec'd the cam I used.  He sent the CNC data to Steve Slavik at Lunati for grinding.  I have the lobe numbers at home, will post them tomorrow.  Steve worked with Harold at Ultradyne for many years.  He should be able to set you up.  The duration, as well as the lift, of the lobes I used is much smaller than the one in your motor, as you probably noticed.  There are many others in the series to choose from.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Ken_Parkman Quote  Post ReplyReply Direct Link To This Post Posted: Oct/04/2017 at 6:48pm
BTW the 2.52 csa shows a peak of about 6800 on the calc I use. I'm of the opinion too high a velocity is a bad thing, especially on a stockish port height like the Edelbrock. Just too hard to keep the flow attached on the ssr. Clearly it works well in your combo!
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Post Options Post Options   Thanks (0) Thanks(0)   Quote amcenthusiast Quote  Post ReplyReply Direct Link To This Post Posted: Oct/04/2017 at 7:23pm
Congratulations on the great running well sorted out engine, proving again there is more potential in AM V8s than most mainstream auto enthusiasts are willing to admit.

One more example of an intelligent AM V8 engine builder who's used my "AMC V8 Oil System Modifications" information successfully.

*notice the rods don't have the stock oil spurt feature either, which is key to building a successful '56-'67 AM RV8 race engine also.


Edited by amcenthusiast - Oct/26/2017 at 9:14pm
Link to XRV8 Race Parts website: http://amcramblermarlin.1colony.com/favorite_links.html
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Post Options Post Options   Thanks (0) Thanks(0)   Quote SKeown Quote  Post ReplyReply Direct Link To This Post Posted: Oct/04/2017 at 10:05pm

 "One more example of an intelligent AM V8 engine builder who's used my "AMC V8 Oil System Modifications" information successfully."

 Those mods are?

 SKeown
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