Just out of interest, I found it interesting to study the 2008 & 2009 EMC results in some detail. One thing that stands out, and I've never heard anyone mention it or write about is the following; No entry qualified in the top 15, unless it's "roll in torque figure" (in both those yrs it was @ 2500 RPM) "exceeded" the engines displacement... In fact, in 2009 the top 20 qualifiers torque numbers exceeded their displacement @ 2500 RPM. Which brings up the question, what would be needed to have a Y- Block meet that criteria ?

Paul

Well, our turbocharged 292 pulled out 630 Nm of torque at 2600 rpm and that equals 464 lbs ft. Though, they don't allow chargers...

 Seppo from Järvenpää, Finland
www.hollowheads.net (just click the hole in the head to proceed)

The rpm range for 2009 EMC competition was 3000-7000 rpms.  For 2010, the rpm range does go back to 2008 operating range of 2500-6500 rpms.  Last years Y EMC engine entry was actually built for the 2500-6500 rpm range so it was at a disadvantage from the git go operating in the 3000-7000 rpm range.  The rotating assembly was appropriately built to handle up to 7500 rpms without issue but camming and the heads were not.

 

Because of the mandated 3000-7000 test range, last years EMC Y entry was subsequently tested heavily starting at 3000 rpms but there were a small number of dyno pulls starting at 2800 rpms at which point the torque was 380 lbs/ft with the engine setup per the rules.  But it was found that 3” of carb spacer helped the lowend torque numbers significantly but the rules mandated a maximum of 1” of spacer so that option was out.  So in answer to your question, a different intake manifold would be at the top of the list.  Camming and headers comes in next.  Last years engine also did not take full advantage of the the potential in torque increase that comes from increasing the compression ratio as the EMC entry last year was right at 10.2:1 scr.  Running on 91 octane with the iron heads last year had much to do with why the compression ratio was where it was at the time.  This years entry will be closer to 11.0:1 with the new aluminum heads on it.

 

I’m still on the EMC alternate list at this point so it’s still iffy how this years competition with a Y will play out.

Lorena, Texas (South of Waco)

I think the beercans on cooling system are banned too.





Maybe someone mate newer variable lenght intake manifold to Y-Block. That would be good for wide RPM range.


Hyvinkää, FI

Ted: Sorry, I used the wrong dates. It should have read 2007-8, not 2008-9. However, the roll in torque situation still applies, an entry must be very strong on roll in torque or it's not going to place well.

Paul