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My Profile! · by **BZR4AGE** » Mon Dec 14, 2009 9:22 pm

Was doing some track time during the weekend at Hemptons Down.

After the third session when I was going into the pit slowly, I've notice a strange tapping noise.

Parked in the pit, popped the bonnet, and there is a tapping noise around the head. Came from in between the throttle bodies, head and injectors. I don't think is a metallic sound or anything...almost sounded like injector ticking noise but 1000x louder.

Have pulled apart the rocker cover, everything seems fine, drained all the oil, couldn't find any trace of metal or bearing at all.

What should I try next? drop the sump? or take off the whole head. I am kind of a newbie, but I thought I want to give it a try finding the issue first (good learning experience I think), then get a engine builder to fit it back together for me.

by **CAMB01** » Mon Dec 14, 2009 9:52 pm

Carefully cut the oil filter open and inspect for bearing material etc.

by **BIG-AL** » Mon Dec 14, 2009 10:06 pm

Have you got new injectors?
I put larger injectors in my car and it makes similar noises
Don't know why.

by **CAMB01** » Mon Dec 14, 2009 10:08 pm

But from what he is saying it didnt have a noise till he came back into the pits after racing, so i doubt its the injectors

by **matt dunn** » Mon Dec 14, 2009 10:08 pm

not the vvt pulley is it?

by **CAMB01** » Mon Dec 14, 2009 10:09 pm

I think he is running adjustable cam gears both inlet and exhaust, so no VVT

My Profile! · by **BZR4AGE** » Mon Dec 14, 2009 10:43 pm

Will cut the filter tomorrow!

Yes, no VVT, full engine built with Toda parts, silvertop shotpeaned rods, arp bolts etc.

Not new injectors

by **sergei** » Mon Dec 14, 2009 10:46 pm

Perhaps a bolt/stone inside of inlet bouncing off valves?

My Profile! · by **BZR4AGE** » Mon Dec 14, 2009 11:06 pm

It could be a loose bolt? but the tapping noise was in a pattern, so I don't think it will be it. and it dosen't happen throughout the whole rev range. only happens between 2-5k rpm..and goes away after that, hence why i didn't notice it during the track as I was contantly above 5k rpm, and only found out as i was warming down.

by **matt dunn** » Mon Dec 14, 2009 11:21 pm

the adjustable cam wheels are not loose in the adjustment?

Check the valve clearances before you pull it too far apart.

by **Mr. Mainstream** » Tue Dec 15, 2009 8:25 am

viewtopic.php?t=67634 for more of his specs

hope you get this sorted bud, sweet looking engine bay

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