Call thunder racing and give them the # on the cam tomorrow and see wtf is up. I stuck a trex in my car like 6 months ago for like a month and it cleared just fine....

 

alright ill do that, thanks guys

 

V1 240/244 .605/.596 112 LSA

Buddy of mine had it in his 6 speed trans am. Sounded nasty and pulled like a freight train

 

o, i think i got it figured out. First of all im idiot, second of all with the checker springs on the heads i was tighting the rocker all the way down and it was compressing the valve instead of the lifter, so i do have clearance but not much at all, so far it looks like about 25 to 30 on intake and 35 to 40 on exhaust BUT its very hard to check in the car so thats why i say theres about 5 difference.


SOOOO............... next question is, How tight are you guys running these with no problems???? I know what it should be, but what are you running??

 

I had about the same clearance as you......its scary. When I took my heads off this winter you can see tiny marks in the pistons where a few of the valves must have barely came in contact with the piston. Never bent a valve or had any problems though.

 

thats all i needed to hear lets give it a shot

 

Did you check for Coil Bind on the Springs?

 

Yea, that checker spring will just keep comressing

25-30 is not safe. No way would I ever fire the motor up. Your looking for at least .080"

 

If you can't get it, I know of a cam you could go with. 242/248 111 lsa. If you want, I'll send you the emails from the grinder...he isn't a sponser here, but on many of the other forums he is.

 

yea i know, i need more but im sure guys are running it that close. its definatly going to leave marks in the pistons but i wonder how bad lol. Im gonna get a better reading for ya

 

You really should flycut the pistons for a cam that size with the stock heads. .45 is not enough clearance. You dont need a cam that size to get the sound you want. My cam is only a 230/236 and sounds just about like my MS4 did.

 

i seem to remember along time ago this cam was in a discussion and it seems like alot of the guys only had around .045"-.050" or so on intake side clearance ( but that is just going off memory) but however much it was it was alot less than the .080" like everybody wants to have. if you have some good springs and keep a check on them it may last along time because i'm sure there have been a bunch of those came put in and not even checked ptv. good luck.

 

Good luck with it Todd! Glad you were able to resolve the issue.

 

I wouldn't mind seeing .70 as you still wont have any problems even if you stack bearings, but .40 that is asking for some carnage when something fails.

 

not bashing on anyone on tech, but why buy a big *** cam that you run such a risk with... why not get a little smaller cam and call it a day... honestly you miss a few shifts and your toast... not worth it IMO!

honestly that extra 10 hp your getting over the next level down cam is just not worth blowing your motor unless you just love to spend money and get cut up and greasy all the time..

Hope the car runs great and that you dont have problems down the road
good luck!

 

Ive ran this cam for a little over a year now spinning it 7250-7300 going through the traps and no problems what so ever. Awesome cam in my opinion!

Darren

 

yea! that bmf does pull hard to 7k
i never install cams anymore unless i can cut vr's and degree.
all those nocutting required cams, seen most of them leave the tiny eyebrow indentions. not acceptable to me.

 

The clearance numbers you are reporting are about average for a TRex. I know conventional wisdom says you should run .080" in/.100 ex. but with an aluminum block, we have gotten away with this for years. The cam is a single purpose drag racing grind. It is not meant for the faint of heart. I know people drive it on the street all the time but that is not what it was designed for. As long as you let the engine warm up to temp before beating on it, you should be fine. Just don't miss a gear...

Thanks,
Shane

 

got that right dont miss a gear.too bad our track is closed or else I would be beating on this cam.

 

exactly....

well got her fired last night and didnt sound like a two stroke,lol. honestly it sounds great and just what i was looking for, now i cant wait to feel the power