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EMC Y-Block Report

Posted By Ted 16 Years Ago
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Ted
Posted 16 Years Ago
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aussiebill (10/12/2009)
..... could you explain the crank/rod combo and how the cam/rod clearance was achieved, as thats a massive stroke for this engine....
Crankshaft is a billet piece with Honda rod journals (1.889”).  The rods are 6.750” long and incorporate 3/8” rod bolts instead of 7/16” so they can be pulled in tighter to the bearing itself.  If I hadn’t gone with the .595/.602” lift on the cam, the rods would have cleared the cam with the smaller base circle.  But the rods did require a bit of tweaking at the tops of the rod bolt areas to clear the camshaft with the extra lobe lift.  Targetted for 0.050” clearance everywhere, not just the four rods that came close.

 

aussiebill (10/12/2009)
.....and was it a single 4bbl carb/intake? many thanks. regards bill.
The new Mummert single four dual plane intake was used with a Holley 950HP carb (carb actualy flows 824cfm at 1.5Hg).

Lorena, Texas (South of Waco)


Ted
Posted 16 Years Ago
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Doug T (10/12/2009)
If the competition rules stay the same for next year and the Aluminum heads do not materialize or (what I would like to see) the rules change to require OEM iron heads would you go for a smaller engine?  If I remember past EMC results there were engines as small as 288 CID.  I can't estimate how much extra would be gained in specific output but if going from 375 to 300 cid would result in a 10% increase,  you could be looking at about 400hp on your dyno.

Besides the iron heads, the Y seemed to have the least exotic induction system of any others I saw pictured on the EMC web site.  Are you thinking of any improvements on that side?

The rules this year allowed engines as small as 280 cubic inches.  That got a 4.6 Ford Mod motor into the show.

 

Regardless if the heads are iron or aluminum, the smaller cubic inch Y engine would have been more favorable under this years rules format.  I know that now but in hindsite would not have known before actually testing this combination.  Better flowing aluminum heads will obviously support a larger engine though.  There’s no doubt in my mind that last years 316 engine with this years iron heads would have produced a much better score this year while potentially still coming close to the 400HP barrier with a pump gas combination.  At the EMC competition, it’s all about the score and not the peak values.

 

This years rules format specified a cast intake manifold without external modifications and the Mummert intake was definitely the best available.  A big Thank You goes out to John Mummert in getting me some of the new intakes to work with for this competition.  The next best intake design on the list was the Blue Thunder.  Most of the 3X2 and 2X4 intakes as originally cast are not the big power producers for this kind of competition and especially if limited to the carb bolt patterns that came on them.  If a good single plane design had been available, then that may have helped the overall score.  Testing is really the only way to know for sure on any of this.  This particular engine saw seven different intake manifolds on it during testing along with a variety of carb spacers and carburetors.  But an injection intake with Webers would be worth looking at based on the performance of the early Hemi that was running that combination this year.

 

The 375 incher did surprise me in testing when I tried a 1050 Holley Dominator on the Mummert intake and it made even better numbers.  Made three pulls with the Dominator and as I leaned the mixtures, the power levels just kept climbing.  Started out with 88 jets square and was down to 81 jets square by the third pull with the indicators still pointing to the engine being on the rich side with 81 jets.  And the Dominator idled just fine and cleanly with all the jet combinations.  Unfortunately I was already in a time crunch situation at that point and didn’t have the aluminum stock available to whittle out a spacer/adapter that would fit the rules.  For the test, I used a 2” adapter I had on hand just to try the Dominator carb and that particular adapter was just too tall as required by the rules.

Lorena, Texas (South of Waco)


JJ
Posted 16 Years Ago
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Congratulations,

What a great team and a great accomplishment - JJ

aussiebill
Posted 16 Years Ago
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Ted, thanks for sharing your great adventure, twas a motley crew indeed! we all are still excited, could you explain the crank/rod combo and how the cam/rod clearance was achieved, as thats a massive stroke for this engine, and was it a single 4bbl carb/intake? many thanks. regards bill.

  AussieBill            YYYY    Forever Y Block     YYYY

 Down Under, Australia

Doug T
Posted 16 Years Ago
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Congrats Ted!!

Great job and vindication for all of us Y-blockers.  Y's are definitely running with the Big Dogs now.

If the competition rules stay the same for next year and the Aluminum heads do not materialize or (what I would like to see) the rules change to require OEM iron heads would you go for a smaller engine?  If I remember past EMC results there were engines as small as 288 CID.  I can't estimate how much extra would be gained in specific output but if going from 375 to 300 cid would result in a 10% increase,  you could be looking at about 400hp on your dyno.

Besides the iron heads, the Y seemed to have the least exotic induction system of any others I saw pictured on the EMC web site.  Are you thinking of any improvements on that side?

Let the hot stove discussions continue.

Doug T

The Highlands, Louisville, Ky.


Hoosier Hurricane
Posted 16 Years Ago
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Way to go Ted!!!  The publicity from this effort has to help our cause.  You have proved the limit of ported Y heads, so now we wait for John's aluminum pieces.

Paul, now you know how the 375 inch motor came to be.

John - "The Hoosier Hurricane"
http://www.y-blocksforever.com/avatars/johnf.jpg

Hollow Head
Posted 16 Years Ago
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Ted, thanks about those water pump pics and congrats about that good show at EMC! Waiting to see an unblown 500 hp Y-block in near future from you BigGrin.

http://forums.y-blocksforever.com/uploads/images/e3fd9a79-e7c3-47ff-a648-8cd5.jpg Seppo from Järvenpää, Finland
www.hollowheads.net (just click the hole in the head to proceed)
pegleg
Posted 16 Years Ago
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Like I said before, Fantastic effort when measured against mostly newer engines  (50 years newer!) with the real restriction of 50 year old cast iron heads. A stiff blocked, smaller inch motor with John's heads could easily crack the top ten. That'd give them something to think about!!

Frank/Rebop

Bristol, In ( by Elkhart) 


Glen Henderson
Posted 16 Years Ago
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GOOD SHOW TED!! Those numbers have too have surprised alot of bystanders and maybe we will get some good press from your efforts. With Mummerts heads and more compression looks like the roadster could get in the eights.

Glen Henderson



Freedom is not Free

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Ted
Posted 16 Years Ago
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Here are some pics showing more detail on the electric waterpump.



Lorena, Texas (South of Waco)




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