Very noisy top end

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ChrisJC
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Re: Very noisy top end

Post by ChrisJC » Tue Jun 11, 2019 8:24 pm

My experience with lifters is that once they are full of oil (which takes about a nanosecond once the engine has started), the only way to get the oil back out is to take them apart! I couldn't bleed them back down in the vice at all.

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garrycol
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Re: Very noisy top end

Post by garrycol » Wed Jun 12, 2019 4:41 am

In my limited experience with the RV8 (two rebuilds) top end noise is either a slipped liner or sticky tappets - nothing else really.

So in this case there would be a sticky tappet. The other aspect to double check is that the rocker shaft posts have been installed the correct way around and that the oilways into the posts are not blocked.

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Re: Very noisy top end

Post by DEVONMAN » Thu Jun 13, 2019 10:02 am

Are you sure you have Crane anti pump up lifters fitted and not the Rhoads bleed down type ?
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Re: Very noisy top end

Post by minorv8 » Thu Jun 13, 2019 6:25 pm

Yep, it says 99284-16 on the box. I bought a set of Comp Cams lifters, just had not time today to tnker with it. Maybe tomorrow. The wife is away for 3 days so I have plenty of quality time !

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Re: Very noisy top end

Post by stevieturbo » Thu Jun 13, 2019 10:28 pm

ChrisJC wrote:
Tue Jun 11, 2019 8:24 pm
My experience with lifters is that once they are full of oil (which takes about a nanosecond once the engine has started), the only way to get the oil back out is to take them apart! I couldn't bleed them back down in the vice at all.

Chris.
It would be interesting to remove a lifter to see if it is full of oil....which it should be. And yes, they should be difficult to drain back down, and would take effort/time
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Re: Very noisy top end

Post by minorv8 » Fri Jun 14, 2019 2:47 am

Stevie, I have removed all lifters from LH bank and took each of them apart. All very hard to press down, had to do that it a big bench vise. Oil oozed very slowly out. I pressed them down just enough to get the circlip out. All eight lifters had oil in them. Whether they were full, hard to say. Judging by the feel whilst pressing them down, yes.

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Re: Very noisy top end

Post by minorv8 » Fri Jun 14, 2019 7:08 pm

Okay, had some quality time with the engine. I replaced the Crane lifters with Comp Cams lifters. Cleaned them, dipped them in oil, installed them and primed them without valve train fitted. Oil through all of them. Fitted the pushrods and rockers. Big surprise ! No change... still rattles.

I'd say there something wrong with the rest of the engine.

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Re: Very noisy top end

Post by stevieturbo » Fri Jun 14, 2019 9:26 pm

Sounds like they're certainly getting oil ok then ?

Does the noise change if you place your hand on the intake plenum ?

If you use a stethoscope or similar...can you maybe get closer to a source ? One bank...both, other ? Maybe a rocker issue themselves ? Although cant really think what.
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Re: Very noisy top end

Post by DaveEFI » Sat Jun 15, 2019 12:55 pm

minorv8 wrote:
Fri Jun 14, 2019 7:08 pm
Okay, had some quality time with the engine. I replaced the Crane lifters with Comp Cams lifters. Cleaned them, dipped them in oil, installed them and primed them without valve train fitted. Oil through all of them. Fitted the pushrods and rockers. Big surprise ! No change... still rattles.

I'd say there something wrong with the rest of the engine.
Real mystery, since you've covered all the valve train things.

Does the noise vary with engine load - like when revving it up or it slowing down? Does it change if you pull a couple of plug leads off?

Valve train noise should be pretty constant (apart from speed). Just clutching at straws, though.
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Re: Very noisy top end

Post by JSF55 » Sun Jun 16, 2019 8:30 pm

How many shims have you got under the rocker pedestal's ?
So thats where it went !

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Re: Very noisy top end

Post by minorv8 » Tue Jun 18, 2019 4:20 am

Stevie, both banks and front to back.
Dave, yes it varies.
JSF55, only one set of shims. I don´t like stacking them.

No more progress this weekend as I had better things to do. I have basically given up and waiting for an inspiration to pull the engine.

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Re: Very noisy top end

Post by DaveEFI » Tue Jun 18, 2019 8:10 am

Is the exhaust system exactly the same as you had with quiet tappets?
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Re: Very noisy top end

Post by minorv8 » Tue Jun 18, 2019 1:03 pm

Yes it is. Only components changed are the block, crank, rods and pistons.

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