Engine Teardown of Razzyh 2056 Type 4 engine

Not a bad looking engine for one that's got 500,000 miles on it
Tony

 

The type 1 pump into a type 4 is something Jake Raby does too... maybe parts are easier...

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You can’t buy new VW Type 4 pumps and a Type 1 pump fits a Type 4. And Jake fits 30mm pumps, but he modifies the oil system when he does.

 

Any more updates?

 

I bolted the case back together and crank and checked the deck height and got my syringe out to measure the chamber & dish volume and ended up with a compression ration of 10.3

The engine was severely overheated. There must have been sparks flying inside that engine. The rockers have heat stress marks and scoring on them due to the lack of oil.

Amazingly the cam is still good. It is a testimony to how good Webcam cams are. Going to put it in the next engine I am building.

 

I guess I win then.

 

10.3 is way too high a CR for these engines

 

@PeaSoup nick you got LVH Engines to sort out your engine yet? You had exactly the same issue as me.

 

@nobody You said “I bet its piston hitting the head. That or tappets.” I don’t think you’ve won the prize, yet.

The CR is far too high for the cam and the oil pump is far too large for the engine.

The high CR would have helped the engine develop the claimed BHP but at the expense of a high risk of detonation and extreme heat within the combustion chamber.

The 30mm oil pump would have overwhelmed the oil pressure control valve and the pump would have been under very heavy load. And I think I read that 20w/50 oil was used – that would have made the problem even worse.

The oil pump drive doesn’t appear to be keyed. @Patrick Nguyen could you hold the gear in a vice and see if you can turn the drive shaft; you shouldn’t be able to make it slip no matter how much force you apply.

 

Yes that’s the oil per the engine builder

 

I disagree with you if the engine would be loosing pressure then you could see it from the bearings. and yes high CR piston inertia while at high revs pushes it just this much to kiss the head and you have what you see on the video, sure it could be detonation too but that engine would fall apart if that would be the case. Not oil or tappet related.

 

There’s not much left of the bearings to see anything.
I agree inertia at high revs can push the pistons into the heads, and there was a lot of clearance on those big end bearings, but there is coke build up on the heads (one side worse than the other) and I don’t see any indication that the pistons have touched. I don’t see any indication of detonation damage either.
PS. I didn’t say you haven’t won, I said you haven’t won yet.

 

What was the deck height? The combustion chamber volume of a standard 2.0l is around 50cc, is that what you have? And what was the piston dish volume?
In theory the step in the heads replicates the head gasket and the CR remains standard without cylinder shims so there is something very odd here to get such a high CR.

 

Do you mean oil pressure?

The oil pressure was always very poor in my eyes. At tickover barely moved once warm.

 

Yes AMC’s

 

Flat piston heads will push the CR up a fair bit too..

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They’re dished, but we don’t know the volume.

 

The engine builders comments on compression ratios are very interesting: (see end of thread)

http://thelatebay.com/index.php?threads/52108/

I'm not technically competent, but I make up for it with good research!

 

Post 42?