I have an Apten ported Eaton M112 with the stock Lightning blower pulley and a +4 lower pulley and I'm seeing a consistent 12psi boost.
I have upgraded my heat exchanger to the AFCO Lightning version.

What is the max boost you folks are getting out of your M112 before you are trading off power due to heat?

Can the ported M112 handle 22psi without excessive heat build-up?

Thanks

 

There is no clear answer to this question, nor can there be one. The heat-power tradeoff is happening stock. Any pulley causes a greater tradeoff. At what point do you want to stop?

Once again, your use of the word "excessive" makes it difficult to answer. What is "excessive?" But there is no way that any sane person could describe the heat coming out of any M112 at 22 PISG as being anything other than "excessive."

 

Been there done that.........

20 1/2 lbs boost with the Eaton. Then went the Apten (Best Port job around, besides what Rob says ) and went to the promised land of 22 1/2 lbs of boost

Moved on to a Magnum

 

Tim's graphs are only relevant to stock blowers.

Once they are ported they become more efficient.

(oh boy here we go, I used the word "efficient" without 100 pages of scientific evidence to back it up)

 

Lightning mods should be rated in SATAN POWER !!!

 

Ported or not, at 22psig, you would have to be able to pop popcorn with the air exiting any roots blower.

BTW, my theory remains that lower ported blower IAT2s are more from better directing air through the intercooler than from heating the air less through the blower. Doesn't matter on the road -- cooler is cooler -- but we are talking about heat from the blower here. I am thinking of an Apten or Steg port myself. If for no other reason, the lower temps.

 

AGEED!

Quote:

BTW, my theory remains that lower ported blower IAT2s are more from better directing air through the intercooler than from heating the air less through the blower.

AGEED!

Quote:

Doesn't matter on the road -- cooler is cooler -- but we are talking about heat from the blower here. I am thinking of an Apten or Steg port myself. If for no other reason, the lower temps.

AGREED! You should've done it a year ago during the group purchase. I was a little skeptical about case flex, but I think the last has shown that is no longer an issue.

 

Ok all,,guess I'm going to bump it up to 22psi on my Apten ported M112 and see how I do on the dyno without pinging.

Also, will I see belt slip at 22psi?
I plan on putting the smaller blower pulley on and a +8psi lower (if that exists) and then a gatorback belt.
If so, best way to eliminate it (read, product/vendor suggestion)?

thx.

-adam

 

I don't know if 22# is possible with a eaton.
Will the belt slip. ABSOLUTELY! The BEST way to eliminate it is to purchase a magnum powers idler pulley kit. It is the BEST! Ask Rob, he has a bunch of pics

Gatorback is not the best belt. They slip. Gates is the recommended brand.

 

 

 

Pretty funny.:-)
Well, I believe I can use that big lower pulley with a Magnum or a Whipple later on. Might as well take the Eaton as far as I can before chucking it in the can.

-a

 

The eaton Might survive, but the engine won't if it's stock

 

For a stock M112, I thought 14 psi. was the max. boost level before "diminishing returns" kicked in and too much heat was generated and therefore, not enough hp/tq. increases .....and for a ported M112, I thought the same pulley combo produced 15-16 psi and was the max. for the ported versions?

 

I thought the same thing when I saw the boost you said you were getting, only 12 lbs of boost??

I see about 14 on warm days and as much as 16 on cool crips days (Autometer Phantom gauge). I have the so called "new and improved" Stiegemeier port, so this may be why the boost is up over the older Apten ports.

Anyway, I agree with the other posters, I wouldn't want to spin my ported blower much more than what I have (maybe a 6lber in the future, BIG maybe).

If I decide to step up to more boost, I'll go with a KB, Whipple (in two weeks!) or maybe a Magnum Powers (not sold on this one yet).

Steve