realcanuk

It goes like this. My car was behaving as though it had a miss, but showing no miss fires in the logs. The only unusual thing I could see was a slight, but very steady little hiccup in the MAP reading.

I have to say thanks and give credit to Dave Steck. With just the little info I gave above he immediately said it sounds like a broken valve spring.... and bingo.... he was right on.
The reason I say I got lucky, is because we all know a broken spring can lead to some ugly damage, but nothing...... just the spring.

I also want to thank Brian Tooley and his guys on the phones. The most amazing service ever. After speaking with Brian, he said it is extremely rare for one of these springs to break and there could be another issue. Guy is a genius.... because he insisted its so rare we dug deeper, and found that through a series of miscommunication, I had the wrong spring locators.

I am pissed at the moron who assembled the heads, since I feel he should have noticed this, but that ship has sailed long ago. No big harm done thankfully.
Brian sent me out new springs overnight and we installed them with the correct locators. All good.

While I was at it, I decided to replace the intercooler to throttle body pipe with a new 4 inch one. I didn't like where I had put the MAF before, so I also moved its location.

All that is left in beads on the pipe, powder coating and a little fine tuning for the bigger pipe.. Should be back together tomorrow.

schpenxel

Now that is one broke *** valve spring

Very glad you caught this. Many (including me more than likely) would have kept driving it and likely destroyed something.

realcanuk

I am like that. If I feel the slightest thing seems wrong, I have to figure it out. This time a good thing........ sometimes just drives ya crazy. LOL

Xtremespeed

Glad you saved it. What was the difference in the new and old locators?

neverstop

phew! close call, that spring is seriously busted. sometimes it's hard to tell with these monster setups when something that small is off what exactly is going on so nice work figuring that out. would suck to grenade that beautiful motor that early in its life....

realcanuk

when I ordered the springs, I was asked... bronze or regular guides ? I have bronze guides and I guess normally these are bigger, so that's what Brian sent.
On my oddball heads, it seems the bronze guides are the same size as non bronze. Because of this the center hole of the locator was too big and allows the bottom of the spring to move around.

Unreal

Blame Canada.

Good catch. I'm thinking of swapping springs, but need to get all my other work done first.

Xtremespeed

Gotcha. That would make sense. Good info for people to be aware of.

neutron82

ugh that sucks!... I'm glad you were able to catch and correct it before it got any worse and it is also good to see people supporting each other and helping out rather than just selling parts

lt1z

Curious what cam you are running with the 1.82 rockers? Moving the MAF is also going to effect your tune quite a bit.

realcanuk

My cam was spec'd taking the rockers into consideration. Its .610/.637 lift.

Yes, I expect that change but the bigger pipe will change it anyways.
Its all together and running great. I am amazed at how much the pipe size effects the maf readings. I added 30% across the board, and now will be fine tuning over the next few days. Cant hurt to extend the maf range, that's for sure.

New pipe completed........


On a side note, my shop just got the latest software for the dynapak. It has a very cool quarter mile simulator that takes the data from you dyno run and calculates quarter mile time and speed. No clue yet how accurate it is, but they seem to think it will be... Actually almost makes sense for my car, from what I have seen others run. I guess I will find out if I make it to the track.

neverstop

looks good!

also not sure what methanol tips you are running but if dual M15, Julio at Alky control recommends putting those tips as far from the throttle body as possible down by intercooler outlet to give plenty of time at high rpm for gas phase change and even distribution. not sure how much it really matters but just fyi.

realcanuk

Good info.. but too late for me. LOL ! Actually, I was running a 10 and 15, but found it too much. Trying a 15 and 5 now and will see how that goes.

Unreal

Just means you don't have enough air. Dual 15s is what the cool kids run.

realcanuk

I ain't cool enough for that much meth !!!

COSPEED

Both very respected and knowledgeable!! Far to many shops do NOT properly heat cycle new valve springs when doing a cam install and that leads to breakage down the road. You MUST heat cycle them a few cycles before revving high to avoid this.

Good thing you caught it before worse happened!

realcanuk

Yes! I used to preach the heat cycle thing but for some reason most didn't want to hear it. I always do it myself.

COSPEED

Smart man!!!

timmyZ06

Jeez bud that was a close call!! This is why its a big plus of building a car on your own. A lil change in something and you know it, could save a motor!!! what Seth says about that 4'' intake? Im guessing putting 30% across the board speaks for itself!!

realcanuk

Definitely get to know the car well when doing stuff yourself. I did a little logging and the 30% was almost dead on for idle and near idle, but still needs more after that. I will get to tuning tomorrow or this weekend.
The 30% was just calculated by the volume difference the larger pipe flows, just to get a starting point.