WTFWSAT

Yeah we have run it to operating temprature and it makes no difference to noise or rpm. It also doesn't change under load drive up hills etc.

Yeah we've tried a stock tensioner. As well as pulling nylon bushes on the end of the tensioner to cushion any vibrations but it doesn't change the rpm range or pitch of the noise. The only thing that changes it slightly is letting tension off the chain until it's quite loose which makes the rpm range lower that the noise comes in at.

The timing chain jumped teeth due to the tentioner failing. (Not naming brands but it wasn't a cheap tensioner) It's now a solid tensioner so it can't fail again. The tune is the same as when it came off the dyno last time. Although we did have to pull quite a bit of fuel out of it to make it idle properly with the new head. Cams are "very big". Maybe 310degrees of duration and 15mm lift. I can't recall exact specs at the moment. The only thing that has really changed from before to now is the head casting. There was no hint of the noise previously, but now it's very audible. The video doesn't do it justice. It's not good. All the lash adjustments are right, can journal clearances are right, the sprockets have all been replaced and have been checked to make sure they're running true etc. thanks for your input.

This is very similar to the conclusion we've come to. Something completely unrelated to the timing chain is causing a harmonic and it just happens to be that the timing chain is what is turning the vibration into a noise and thus, creating the allusion that the timing chain is the issue. When you are standing in front of the car and it makes the noise, you'd swear it was the chain rubbing on the tappet cover, but it's not. I'm 100% sure it's not rubbing anywhere. We really appreciate everyone's input on the matter and we're just hoping someone has witnessed a similar situation and it can be an easy fix before we pull the engine down completely and start again. I should have started the thread myself but didn't want it to look like I was defaming the engine builder but it appears everyone knows who we're talking about anyway.

The block is o-ringed. It did have o rings in the head as well but it was cutting threw the gasket. Copper head gasket made by a place in Melbourne. Can't remember the name at the moment but I can find out if anyone wants to know. 14.3mm L19 head studs.

A few pics of the head before it goes on the motor. Solid roller rockers and double valve springs Cnc ports Cnc combustion chamber, 4mm oversize intake valves, 2mm oversize exhaust valves and beryllium valve seats

Sorry for the late reply Brad. I'm pretty sure they're 14.3mm from memory. The new rods have finally turned up. Custom billet alloy by a company in the U.S. called R&R. The motor should be going back together next week. Rated to 2200hp and 11000rpm. I don't plan on pushing it that hard but I'd rather a bit of extra reliability rather that saving a few grams on a conrod.

88mm gtx55. A bit smaller than the precision that came off it but will certainly make as much power as it'll ever be able to put down.

Yeah I hope we can make it what it was meant to be. Considering how willing Matt is to max out my credit card though, it should be fine. Haha

The rest of the car is just as impressive. The 9" diff is rated to 2500hp as well as the gearbox. The chrome moly roll cage is incredible and conveniently was mod plated before the new laws came in that banned 6 point cages so its one of the few cars in Australia that can be registered with a andra inspected 6 point cage. It has a data logging motec dash and every other piece of motec gear you can buy. 315 semi slicks made to fit in fairly standard tubs. I forgot to mention the parachute. I just need one of those little accessory plates like people have on bike racks to be able to drive around on the street with it on. There aren't many 7 second capable cars that could drive threw a defect station without a yellow sticker and then line up at the drag strip in exactly the same trim.

Good morning everyone. Bare with me if this doesn't work post doesn't work properly. Before I started this thread I'd never made a post on the Internet. Anyway... Billet crankshaft. Made by auscrank in Melbourne. It has a 3.5" stroke which makes it a 3.5L by my calculations but correct me if I'm wrong. It's a super heavy duty bit of gear. Gtx5518 turbo. Garret rate them at 1650hp but they're always very conservative with ratings and because the smaller an engine is, the more it can make from a certain size turbo it should have no trouble going a fair ways past that figure. I'm quietly confident for 2000hp and quicker spool time than the old setup due to the split pulse 6boost exhaust manifold. Custom high compression pistons. I obviously haven't been able to do a compression test on them yet but judging by the lump on top of the piston I'd guess maybe 10.5-11:1 compression ratio. Hence why I suggested its not really a street engine. The conrods are modified small block chev pieces. These will be getting swapped out for some billet alloy ones though. Alloy rods make everything in the bottom end happier because the take any excessive shock instead of transferring it straight to the bearings like steel rods. 2 injectors per cylinder. These are 5250cc/500lb Moran injectors. They only kick in when the 2000cc injectors run out of flow though. Massive billet main caps with dowels and equally massive L19 studs Huge L19 head studs. 5" dump pipe. Because the 4" that was on it when it made 1836hp was smaller than the exhaust wheel. Not good for hp. Hypertune intake with modified ford throttle body so that the fly-by-wire pedal still works and the factory cruise control etc. And that's about it. I didn't get any pictures of the head last night. It has beryllium valve seats, 4mm oversized valves, custom billet rockers with perfect geometry etc so that it can be revved as hard as it ever has to be revved to make as much power as it ever has to make. Anything else you all want to see?

Thanks for vouching for me Brad. Ill post some of the stuff I showed you when I get a chance. Working 80-100 hours a week really takes its toll on my spare time though. Haha

Don't stress. I think the same thing 90% of the time I see people making claims about hp on the Internet. Ill get some pics of stuff tonight.

That's fair enough. What would you like to see? The dyno sheet or the billet crank or the head or a picture of a big ass turbo? I can show you all that but it still won't mean anything to someone who wants to be sceptical. If you wait another couple of months you should be able to see the car in action if it all goes back together as originally planned but even then dyno figures can be fudged. It's only a number. Maybe I should have just kept my mouth shut. P.S. I know exactly where you're coming from. It's easy for any kid to be a keyboard worrier.

I haven't really got any decent pics of the engine but ill be sure to get some as it goes back together.