mustangmark

My mustang runs a Crower solid roller set on a 106 lobe separation. It comes on very aggressively when it hits it's power curve. My boat has a custom ground hyd. roller in it set on a 114 lobe separation which feels more like it has a less aggressive but broader power curve to it.

picklenjim

My understanding is with forced induction a wider LSA would give you better low end torque. Reason being you would have less overlap, the time in which both valves are open at the same time. During overlap the forced induction can blow fresh AF mixture out the exhaust. Therefore with a wider LSA you will have a shorter overlap time but still the same given duration in which the valves are open.

N/A, not so.
tight LSA short low end torque band
wide LSA broader band into the upper rpm's

Budman II

iTrader: (1)

So, on a boat motor, do you even want that much of your torque made down low? Seems to me that you would be more interested in midrange and higher RPM torque, unless you have a heavy pig cruiser that you are trying to get on plane.

In an ideal world, if reversion was not a factor, would we be looking for most of the torque to come in down low and mid range, or at mid and high RPM's? And what profile does a better job getting this accomplished? Also, I would take a WAG that supercharged versus normally aspirated plays a big factor here as well, along with head flow numbers.

MILD THUNDER

iTrader: (3)

The cam in discussion was for a procharger engine. His problem was idling issues, and getting on plane. Engines made 1300hp at 6500,, torque peaked at like 1083ft lbs at 5900. However tq a 3500 was 788. That was where they started the pull, but my guess at 3000 he was barely making 600ft lbs when not making boost. Planing with 120mph props with 600ft lbs on tap wasn't very impressive to say the least.

These are very low 7.8:1 static 522's. his duration was 252/262 on a 114. My overall advice was to bring the duration numbers down, to help build some cyl psi down low. The torque peaks right now where his hp should. Not enough static compression to be runnin the cam he was in a marine 522. Just my thoughts but I'm no expert .

MILD THUNDER

iTrader: (3)

First of all, I had no part in building these engines.

However, if you have a personal problem with me, I will gladly come talk to you in person about it.

Secondly it's bob madera, who i told my buddy to call in the first place regarding cams.

mike tkach

iTrader: (3)

as usual,you have something to say but you have no idea what you are talking about.joe b,the owner of these engines called bob madera,but he also called about 20 other people asking questions because he overthinks things.the fact is anytime a procharged engine with a carb makes that kind of power[and it does]the bottom end torque will suffer because the procharger makes no boost down low,and the cam required to make this kind of power does not have good dock maners.we are now looking into efi so the fuel curve can be taylored around these charestics,that will fix the low end torque issues.riverrat,in the future you might want to get reliable information before you make post full of wrong info,that way you will not appear to be such a misinformed mouth spewing trash talk.whoever you are getting your information from is leading you in the wrong direction,and i suspect i know who that is.

mike tkach

iTrader: (3)

and just for the record,i did not select the cams for these builds,i did not like them from the getgo,but i was overruled by the owner.at the end of the day,the man writing the checks has final say about what goes in his engine.riverrat,it is not as simple as throwing a whipple kit on stock 496 stuff,any dummy can do that.

mike tkach

iTrader: (3)

as usuial,wrong again,you and your buddy are full of chit,but carry on,and i know for a fact bob madera did not tell you anything about this deal,so keep spewing trash,it is entertaining

mike tkach

iTrader: (3)

and yes,i can be funny,or i can be as serious as a heart attac,you are not a funny guy,just a misinformed mouth with something to say.

HaxbySpeed

Why would any professional engine builder allow a customer to dictate something as critical as cam selection if the builder knows it's not going to work? Who chose those heads..?

You have stated several times that people "don't know you" so they shouldn't say anything about you or your builds. You've never met me but did a bunch of chit talking behind my back while I was helping someone else that you screwed with wrong parts. And they called me, and I didn't even know it was you that screwed them. You're a real beauty.. By now I think everyone knows you're a joke. Good luck with your engine business..