I am running the Comp XE 236/242 cam in my heads/cam stock bottom end motor, and I was wondering if I need the Rev Kit. I am asking about this Rev kit because I have 4 collapsed lifters that I just found yesterday. I am planning on trying to get a set of the Comp R lifters ASAP and then was trying to decide if I need the Rev Kit. Here is a little bit about my valve train setup

--236/242 .555/.575 112
--Crane Lifters (now 4 collapsed?
--Comp Pro Magnum 1.6
--Chrome moly push rods
--Comp 987's installed at 1.775 with titanium retainer

WHen I dynoed the car about a month ago, the car did rev to 6900 with no audible valve float. The power did drop off at 6400 like a rock, but the engine reved nice and clean. I would appreciate some opinions on this ASAP.

Brian

 

With your set-up the rev kit would help the life of your springs and assist in a bit more hp. Since your revving 6400 and up, it'll be a good decision to pick it up. If you revved any lower, it wouldn't be worth it.

Plus you can't go wrong for $220!

 

No. I probably would have ran a 985 spring, but wouldn't spend the $ on a rev-kit... Not much chance you'll mis-shift an auto and mechanically overrev it

 

Anyone else have an opinion???

Brian

 

What cars should use the Hydra-Rev kit then...if any?

 

The Hydra Rev Kit basically protects the valvetrain (Specifically the springs) when over or high revving.

I doubt u would see an overall difference in horsepower, but if ur going to be CONSISTENTLY turning 6800+ RPMs, it would be something to recommend, especially on something similar to a solid roller cam.

However, since u have a stock bottom end, I would highly suggest NOT revving past even 6400.

 

Thanks for the insight...

 

I asked seth this same question when i was ordering my top end.

He told me comp R's and their springs (damned if i'll ever remember the number or the specs- i think good to .640 lift?) and i shouldn't worry about it...

FYI-I went with the 236/242 high lift and 1.6 rockers.

 

What horsepower did you dyno at with that cam?

I have the same one with now hydra-rev installed.

 

who are you talking to?

I'm hopeing for 425rwhp but i doubt i'll see that through a stalled auto, i'm probobly going to short shift it by 1-200rpms or so till I get my fluid dampener.. hopefully the torque will be there though

 

REPO,

My car put down 380 rwhp @ 6400 rpm. There should be a few scanned pics of the dyno chart in the link in my sig.

Today I called around to several shops and talked to them all about the AFR hydra-rev kit. I talked to Seth at Combination Motorsports for at least an hour earlier today, and we discussed valve train geometry with car and why the Crane lifters collapsed. He also thought that my torque curve was somewhat weird because it was sooo flat and didnt even really drop off till about 6000 rpm. He said the hp should of peaked around 6700-6800 rpm with how high the torque peaked, but the dyno numbers dont lie. Once I get the new Comp R lifters in, I will make some more dyno pulls to see if there is any difference. I kinda think that the Crane lifters were collapsing above 6500 and they never showed up with audible noise. This is just my theory, and we will find out for sure when I get it dynoed again later in July. I also didnt go with the rev kit as Seth thinks that the Comp R's will fix the problem and the rev kit is not needed. Well talk to you later, and Trey we need to talk about your new cam setup.

Brian