eaton m90 blow or suck ?

[balldrick]

gday guys, I just brought a m90 supercharger for my alloy headed 2v 250 and was wondering if i can run with a blowthrough system? or must it be suck.Ill be using a 4 barrell holley.Any info a great help.

 

[MustangSix]

I've seen them set up both ways. I think the determining factor is whether the blower is equipped with the proper seals to resist fuel getting into the bearings. If not, then blow thru is your game.

 

[350kmileford]

They can definitely run as blow through. I have one, and I will be going this route.

 

[balldrick]

thanks for the replys. so does a blow through system then need a bypass valve?[is that the same as a blow off valve].And would a intercooler be advisable with 7psi? im trying to get as much info as posible so any ideas would help.

 

[MustangSix]

Depends on the blower. Some of them have internal BOV's, like the model used on GM V6 engines.

An intercooler will help lower temps, but adds to the complexity of the installation.

 

[350kmileford]

Depends on the blower. Some of them have internal BOV's, like the model used on GM V6 engines.

An intercooler will help lower temps, but adds to the complexity of the installation.

The majority of them were located outside the blower, in the intake tract somewhere. I heard the most recent were internal, yet I have never looked into it/seen one. Reason being, the newest models are the most exspensive

I would recommend an intercooler. It isn't mandatory with 7psi, though.

It will lower the temps but it will drop about 1psi.

It isn't extremely difficult to do. If you can come up with a mounting system for an M90 I'm sure you can mount and route an ic.

However, people usually recommend that you use a "high performance" front valance....it will have a larger opening for airflow. You may want to take that into account for cost.
http://mustangsplus.com/xcart/product.p ... 351&page=1

OR you could take this route:

With 7 psi, the intercooler may not need to be that big.

P.S. if Bort reads this, he needs to get on AIM more often and not your phone.

 

[69Falcon]

Another alternative would be to use an air/water intercooler, which uses a separate small radiator and pump. A bit more complex, but more flexibility than an air/air intercooler.

 

[Bobscoupe]

I ran a blow thru with a cheap e-bay intercooler. I got from 8 to 10 pounds of boost. The only problems I had was belt alignment and the head gaskets blowing. I didn't think I would have the head gasket problem with only 10 pounds of boost. I was running a standard fel-pro gasket.

I was probably running too much compression. I used an early T-bird charger so I used a by pass valve that I routed from the pipe going to the carb to the air supply pipe. It uses manifold vacuum to actuate the valve.

It was a nice setup with a lot of power especially down low but I could never get it reliable enough for a daily driver. I blew a motor--missed third--so when I rebuilt I just went back to the H/W 5200 but I miss the power I had.

I may do another some day.

Bob

 

[XFlow_Fairlane]

I have though of a m90 on one of the xflow motors I have. would make for one hell of a torque monster

 

[balldrick]

Thanks good info.As eatons are usually set up with throtle on the inlet side of the blower would a recirculating valve before the carb back to the inlet of blower work on a blow through system?And because its a positive displacement blower would a blow of valve as well help in a over boost situation. there does not seem to be to many set ups running blow through with carbs.