getting a custom specd isky is sounding like its a winner. any suggestions besides the triple 12 ground down to 110lsa?

 

Keep in mind when choosing a cam that overlap bleeds off boost. Thumpr cam has 8* of overlap and is a not a good choice for boost.

I know you you aren't looking to set a world record, but it sounds like you want to use boost to overcome a low performing camshaft. If your cam is doing nothing but bleeding off boost, you lose on both ends. Smaller duration is best for the 4.8 and will help with boost in the long run.

My suggestion is a custom grind 214/218 on a 111 LSA. Cam will have a lot of chop to it, make good power, but with -6* of overlap, you won't bleed off near as much boost as the Thumpr.

- Beau @ TSP

 

You want a cam that is under a 220 duration for that small of a motor, other wise the truck will drive like total dog s***. Bogging everywhere eating lots of fuel. Will get old real quick.

 

I heard you in another thread say 110lsa is too low for a turbo. Is this 111 you mentioned going to do better?

 

LSA and overlap are different issues. I can understand the confusion though.

 

Damn he was talking about something diff huh

 

LSA relates to overlap, but duration plays a huge role in that as well.

220/220 110 LSA = 0 Overlap
228/228 110 LSA = +8* Overlap
228/228 116 LSA = -4* Overlap

As duration increases, overlap will increase as well, unless a wider LSA is used to overcome that.

-Beau

 

Ok so as long as my duration is low enough a 110lsa shouldn't be too bad for overlap on a turbo?

 

Right, use this calculator to determine overlap. Closer to 0 (or negative) as possible, the better.

- Beau

 

That's awesome thanks for that calculator mann.I have heard notHing but good thing about the isky triple 12 think that's what I'm going with.. came out -8 overlap