i got a set of used cams with a used motor i bought.they were supposed to be custom turbo cams. the part numbers don't jive with any cam that i have found . they are stock (.390)lift with 224 degrees of duration @.050 on both cams. will they work well for a 76mm or 88mm turbo setup? how will be different from 96 cobra cams as far as power, spool and rpm range? thank you

 

no one can help with this?

 

just get some MMR turbo cams, the best cams out there rite know..

 

I think those cams would work well. The '96 cams only have 204/196 durations with similar lift. The 4V Modulars don't benefit from lift too much. Those cams will help spool and give you more power for sure as they aren't too big. Any larger and you'll start losing spool and you will have to rev it a lot higher. I'd run them.

 

A 224* duration cam in a turbo 4.6L is not that small. It will make really good midrange power and spool quickly. The lift isn't ideal but peak lift doesn't matter as much in the 4V Modulars because of the flow just off the seat. If it was me, running a set of new larger turbo cams would make the car no faster. If for example you are keeping it under 7K RPMs, any larger cam might actually make less average power in the RPM range you are running. A larger cam will start to shift the bigger power you want off the charts. BTW, I didn't read where he said these were "15 year-old technology cams". I guess it depsnds if you want to spend $1300 or whatever on new cams that might not make the car any faster.

 

Well, that’s a really bold claim. There’s a reason the cam sellers never test them back to back. It’s because the gains are not that impressive at all. There are no secrets or magic to camshafts. I know a lot of cam sellers want people to believe that. Yes I know that there are subtle differences in ramp rates, etc. but not to the tune of 220HP! Unless the OP is revving it to 8500+, there’s very little benefit (if any) for larger cams than what he has other than a cool sound. Let’s say he’s spinning it to 7500. Would he pick up some PEAK power at the 7500 mark by going to a larger cam? Probably depending on how large the cam is. Would his car be faster? Probably not because spool would suffer, midrange torque would suffer both on and off boost, and the RPM band will be shifted off the charts beyond the usable RPM range. It would be even worse if he only spins it to 7K. This could be made even worse if the intake isn’t matched to the cams. So I guess the question becomes, how high are you going to spin it and what intake are you using? Like I mentioned earlier, the lift on his cams isn’t ideal but the gains would be minimal with more lift. IMO, it would not be worth $1300 for 15HP. Just add another pound of boost. I would love to see a back to back test also showing this humongous 220HP gain. I’ve seen a lot of 4V turbo set-ups with large cams (yours and others) and revving to 7K and a lot of them are dogs on the street-especially if it is a manual trans car. Stock cams can easily make 1000rwhp (ask 99TTGT) and spin to 7500. That’s pretty impressive from an OEM cam and shows you that the cams aren’t that restrictive.

With that said, cams have their place. If you are building a max effort engine and want to squeak out every last ounce of power, a well-chosen cam that compliments the intake, heads, RPM limit, converter, intended use, etc. can help.

BTW, those 224 cams would be a HUGE improvement over the ’96 cams. The ’96 cams are 204/196 so you are adding 20-24 degrees of duration.

I guess we will have to respectfully agree to disagree on this.