Cam question for supercharged engine

[Fordman75]

I found a cam I want to run in my 300. It's a Crower 284HDP. It has 284/290 ADV. duration, 220°/222° Dur @ .050” Lift:, LSA: 110°, valve lift: .509”/.517”.

What issues will I run into with running a high duration cam with an Eaton supercharger? I've been doing some research on it and am getting conflicting info on high duration cams with a supercharger.

 

[Soldmy66]

I would suggest you call Crower, Comp Cams, etc., tell them your application, and see what they recommend.

 

[FalconSedanDelivery]

You want 112-114 on the lobe sep , (Ive been racing and building Boosted setups since 1986 ) , the 110 would sound cool , BUT ,it will blow the boost out the exh at low rpm , and your headers exh manifolds will take a beating

 

[80broncoman]

You want 112-114 on the lobe sep , (Ive been racing and building Boosted setups since 1986 ) , the 110 would sound cool , BUT ,it will blow the boost out the exh at low rpm , and your headers exh manifolds will take a beating

X2 on the lobe seperation. if you like the lift and duration of that cam call up the cam company and ask if they have it on a 114 lobe seperation.

 

[StrangeRanger]

Crower does a lot of custom work. They'll have no problem providing the cam you need

 

[Fordman75]

How's the wider LSA going to effect the idle? I might be wrong but what I understood was the wider LSA will smooth out the idle. I really want a rough lopey idle. If I go with the same specs but bump the LSA to 112 what's the idle going to be like?

 

[80broncoman]

How's the wider LSA going to effect the idle? I might be wrong but what I understood was the wider LSA will smooth out the idle I really want a rough lopey idle. If I go with the same specs but bump the LSA to 112 what's the idle going to be like?

Yes the idle will smooth out ....some but not all the way. have you ever been to one of the national event tractor pulls with the larger gas or alchol blown engines?? those engines run cams with a slightly wider seperations and have what some describe as a "rolloing idle".
Since the blower is off a smaller engine if you go with the tighter lobe seperation you my have a hard time getting it to build boost.

Stick shift trans ??just turn the idle speed down, instant rougher idle.

 

[Fordman75]

How's the wider LSA going to effect the idle? I might be wrong but what I understood was the wider LSA will smooth out the idle I really want a rough lopey idle. If I go with the same specs but bump the LSA to 112 what's the idle going to be like?

Yes the idle will smooth out ....some but not all the way. have you ever been to one of the national event tractor pulls with the larger gas or alchol blown engines?? those engines run cams with a slightly wider seperations and have what some describe as a "rolloing idle".
Since the blower is off a smaller engine if you go with the tighter lobe seperation you my have a hard time getting it to build boost.

Stick shift trans ??just turn the idle speed down, instant rougher idle.

The blower I'm going with is an Eaton H122 off a Shelby GT500 with a 5.4L.

Yes it's a 4spd.

When I get to the point of actually needing the cam I'll give Crower a call and see about a custom grind. Thanks for the help guys!

 

[80broncoman]

How's the wider LSA going to effect the idle? I might be wrong but what I understood was the wider LSA will smooth out the idle I really want a rough lopey idle. If I go with the same specs but bump the LSA to 112 what's the idle going to be like?

Yes the idle will smooth out ....some but not all the way. have you ever been to one of the national event tractor pulls with the larger gas or alchol blown engines?? those engines run cams with a slightly wider seperations and have what some describe as a "rolloing idle".
Since the blower is off a smaller engine if you go with the tighter lobe seperation you my have a hard time getting it to build boost.

Stick shift trans ??just turn the idle speed down, instant rougher idle.

The blower I'm going with is an Eaton M112 off a Shelby GT500 with a 5.4L.

Yes it's a 4spd.

When I get to the point of actually needing the cam I'll give Crower a call and see about a custom grind. Thanks for the help guys!

Yes call them. off a 5.4?? I was thinking of one off a 3.8 super coupe.
.

 

[Fordman75]

If I went with the little M90 off a T-bird I'd be running two of them! :mrgreen:

 

[LateApex]

I was building a 200 i6 with an M90 and Argentinian head at one time. The M90 was going to be working at its limit in that configuration.

 

[Fordman75]

I'm not going with a M90. I'm going with a Shelby GT500 H122. The same one this guy is running. http://www.youtube.com/watch?v=ZuteL0qLMb0

 

[thelastf100]

hello,did you think about the short nose on the GT and where the blower must be on the intake to line up with the belt and pully's. my nose cone is over 8 inches long but i could have used a 10 o12 inch you can chet a lil when making and building the adapter plate's or intake and carb mounting box,,,thanks,,,,and good luck ,,,keith

 

[Fordman75]

hello,did you think about the short nose on the GT and where the blower must be on the intake to line up with the belt and pully's. my nose cone is over 8 inches long but i could have used a 10 o12 inch you can chet a lil when making and building the adapter plate's or intake and carb mounting box,,,thanks,,,,and good luck ,,,keith

I'd love to run a Eaton off a Ford GT but the few I've seen for sale have been 2-3 times more expensive then the GT500 ones. I'm not going to mount mine on the intake. I'm mounting mine on a bracket high up on the passenger side ( like the one on the youtube vid link I posted above ) . Only I'm going to have an air-to-water intercooler and a blow thru carb.