Instead of swapping cams, I decided to advance the MS3 +4 degrees, to bring the powerband down a bit and pick up some torque down low...the results of this advance were VERY close to that of a G5X1 swap, which is my other cam...

Will this decrease PTV or leave it the same?

I have PRC 5.3 heads, unmilled, stage 2.5, 62.5 cc chambers. 2.02/1.575 valves

Thanks!
Erik

 

You will open the intake valve 4 degrees earlier which will give you potential piston to valve contact if you don't have flycut pistons. If you have flycut pistons, then this is a good move for picking up the mid-range.

 

What is the LSA/ICL of your MS3?

Yeah advancing will reduce the intake side of clearance.

 

Hey fellas...
Thanks for the input..My LSA on the MS3 is 113, no advance...
Pred, how can I find the ICL of the cam, sorry for my lack of ICL knowledge lol

Erik

 

113 no advance means 113+0 or 113LSA/113ICL

ICL = LSA- Advance in grind
If cam retarded (like 113-2)
then ICL is 113 - (-2) = 115 ICL

 

I think that Texas Speed will typically grind 2 degrees of advance in that cam, but the only way to know for sure is to degree it. With no advance (113ICL), the intake valve closing point would be 51.5 degrees ABDC at .050. That's very late for a 346. With 2 degrees advance, it would be 49.5 and at 4 degrees, it would be 47.5. For whatever it's worth, the intake valve closing point on my engine is 48 degrees ABDC at .050".

 

Ahh, thanks Pred, good piece if info there, thanks.

Well, I bought this cam from TSP new, then sold it...then bought it back from the guy I sold it too (ironic huh)
In the process, the cam card was lost...I really do not know if any advance if ground into the cam from TSP, I simply bought it and asked for the 113 LSA...

The only way to know now is to degree it?

If it did have 2 degrees advance out of the box, wouldn't another +4 degrees then leave me with +6 degrees advance? I wouldn't think that would be very good...

Hmm, I am stuck....

What is my next step at this point?
Erik

 

haha that cam really is just trouble

 

just put the lg cam in straight up.

 

That's an interesting statement as most LG cams are ground +4. Putting them in straight up would require you retarding them 4 degrees. If what you meant by straight up was line up the dots and install it with no advance or retard, then I would agree with you. The LG cams have very nice valve events as they come.

 

thats what i meant. dot to dot. and yes his has +4 ground into it.

 

Keep searching Erik, I believe this topic was covered a while back in another post (if I remember correctly it was regarding a MS4 and the difference was minimal). It would be nice to know what kind of advance these are typically ground with and if the MS4 are ground with the same advance. Why don't you call Jason at TSP and ask him how it would have been ground had you just ordered it without any special instructions. He should be able to answer that. I would not fret loosing the cam card much, another guy on here ordered one +2, got the cam card which said +2 and it ended up being +4.

 

MS3 is a 113+0 and the MS4 is a 111+2. PtV will probably be very tight on the MS3 with 4 degrees of advance, but 2 degrees might work.

 

Looks like Ill swap the cam, I cannot run the risk of losing even MORE PTV, and the torque I will pick up with the LG cam will be SICK down low....I did the math with the owner of the shop I work at and we calculated that I would gain about 30 ft pounds in the lower range of the power band...while HP loss up top would be minimal but will occur...big deal, I will take power under the curve any day over top end!

The next step is a 100 shot on the LG cam...NICE

Thanks guys for the heads up...

Also, I plan on building a bigger cubed motor in the future..should I keep the MS3, or sell it and get something different?

Erik

 

i love my g5x3 good midrange and top end

 

If this is correct, then +4 on the MS3 should but the intake center exactly where it is on the MS4.