rez0469

iTrader: (5)

I have an MS4 in my car right now, 02 WS6, and I have had it in for about 2,000 miles and all of a sudden my car stopped working, I took it all apart and the pistons are all hitting the intake valves and one of the intake valves broke in half and got jammed in the head. Isn't it a cam you don't have to fly cut the pistons? It put grooves from the intake valves in all the pistons. Any ideas on why this happened? the heads are stock and never milled and the block has never been decked before. Any and all help is greatly appreciated.

rez0469

iTrader: (5)

and also, I do have the hardened push rods and the PRC kit on the heads.

DONAIMIAN

iTrader: (18)

What LSA did you order the cam on? Weather or not you need to flycut or not is up to you. Some of the larger aftermarket cams will fit in a stock headed motor, but it seems like the line of what fits and what dosent has gotten thinner in the last 2 years.

pdd

iTrader: (3)

did you miss any shifts?

TRU-2GM

iTrader: (6)

what do you mean by stopped working?? what timing chain do you have? could have busted the timing chain. If you busted that, the car would have shut off and the pistons would have slapped quite a few of the valves pretty good. Elaborate on how everything went down...There are a few MS4s with stock headed cars running around here just fine...

orangeapeel

iTrader: (18)

Thread needs more clarification before pointing fingers at the MS4 for motor issues. Especially after it cleared for 2,000 miles already. Sounds fishy.

slow trap

iTrader: (22)

if you clay it you will probably find out you have much less than the .080 thousandths that is recomended. one miss shift or slight valve float and it could be all over.

PREDATOR-Z

rez0469

iTrader: (5)

Well, I have the LS2 timing chain in. I went for a drive then came back home and the car was running fine, put my car in the shop because it had a check engine light on which was random misfire, which it had from day 1 when I put the cam in and 3 o2 sensors bad. I cleared the codes and it wouldn't start anymore so I took the head off and found the valve snapped in half. It ran totally fine before I cleared the codes, then I cleared them and went to start it up again and it would start but you could feel this horrible grinding in the clutch pedal and after about 30 seconds the car would shut off by itself.

021less

iTrader: (28)

Doesnt sound good, i'm about to put an ms4 in my car but i'm having the pistons cut for safety!

Jason 98 TA

iTrader: (4)

The MS4 camshaft has plenty of piston to valve clearance! This camshaft has TONS more p/v than a lot of these super large camshafts being sold on ls1tech.

The most recent MS4 camshaft we tested (LAST WEEK) had:

INTAKE CLEARANCE: 67
EXHAUST CLEARANCE: 81

I think with the camshaft working fine for so many miles that we might be looking at some kind of other issue. Feel free to give me a call when you get some extra time & we can go over a few things with you.

Take some time & run a search on some of the competitiors large camshafts. I think you'll find the MS4 camshaft has CONSIDERABLY better p/v than most of the competitors large camshafts!

Jason 98 TA

iTrader: (4)

You don't need to cut your pistons unless your running a cylinder head with larger valves.

I know everyone's jumpy right now on p/v after finding out a few sponsors camshafts clearances are really bad, but keep in mind guys the MS4 camshaft is a proven camshaft with p/v that has been checked & double checked MANY MANY times!

PREDATOR-Z

Beast96Z

iTrader: (21)

The car ran fine for 2k miles, so the cam isn't the culprit. I'd be more suspect of someone at this shop going for a joy ride and missing a shift, or the timing chain breaking. If the intake valves were broken and crushed back into the head, that's some major contact right there. Slight contact can leave a mild "eye brow" in the piston without destroying the motor. If it was slight, you may have a bent valve, but this is not slight. I'd pop the timing chain cover off and see if the chain is still in tact. If it is, roll it over to TDC and see if it was installed correctlly, "dot to dot".

rez0469

iTrader: (5)

Its my dads shop so I am not woried about that, and the car started and ran for a bit so I wouldn't think the timing chain would be the problem. I could be wrong. The car ran pretty good while the cam was in, the occasional stalling and stuff but I do have stock gearing, (for now, need to save more money). At high rpm (5000-6000) it would always bog, then it hit about 6200 or so then ran and pulled hte way it was supposed to.

rez0469

iTrader: (5)

oh yea, my pistons do have the "eye brows" in them. I wasn't trying to blame anything on the cam, I said I THINK I had problems with it. Sorry if people thought I was trying to say it IS because of the cam

Brian @ Texas Speed & Performance

iTrader: (1)

ATTN: LS1TECH MEMBERS:

Jason just talked with rez0469 about the car & we have a pretty good idea what could be going on. The car was running thin Fel Pro head gaskets & the cylinder heads have been modified from stock. rez0469 is currently checking the deck height on the cylinder head to see how much has been decked off the cylinder heads.

THIS IS NOT A COMPLETELY STOCK LONG BLOCK ENGINE HAVING THESE ISSUES!

rez0469

iTrader: (5)

I am not totally sure but I think the heads are stock deck but I am checking tonight after work. Thanks again TSP, you guys make some amazing products, I can't wait to get it running again, I have the TNT F2 and haven't used it yet.. I will have more info for everyone tomorrow.i will be putting the heads on the car that originally came with the car, I was told from the guy that I bought these heads from that he had those heads with the T Rex and didn't have to fly cut. So we will see what happens.

021less

iTrader: (28)

i'll be subscribing to this one, interested in seeing what the verdict is.

aNuBiS

iTrader: (25)

Some things just dont add up, such as how everything was fine for 2k miles?