Engine Teardown of Razzyh 2056 Type 4 engine

I had a mate who, every time he bolted something shiny to his Escort, used to mentally add 5hp to the power of the engine. I think it ended up with a theoretical power equivalent to a Rolls Royce Merlin...

 

Rolling road must lie then

 

I’m sceptical because there has been little done to the engine to make it more efficient so its power will be related fairly closely to its capacity with similar bhp/litre to standard. I expect the CR has been increased and that will release a little more power but with a mild cam the increase will be small and if the CR is too high for the cams sweet spot the engine could risk detonation damage and overheating for no increase in power.

The small capacity increase adds torque and therefore more bhp and an increase in CR helps but the cam is mild and max torque will be low in the rev range peaking early limiting max bhp. Head work and an increase in valve size would also make an improvement but unless there is some magic going on in this engine it won’t/can’t make 100bhp.

And I didn’t mention the centre mount carb once.

However, having said all that I don’t think the power output is the problem is it?

 

Often yes. It depends on the operator.

 

How much did the stripes add

 

Furry dice = +4hp

 

Power output has never been an issue.

New Subaru engine is 125 bhp but that’s still a 2L

 

and this

 

With four valves per cylinder and fuel injection. Nice.

 

Well I'll put my bids in. Since the knocking is happening more on high revs and the engine builder was always removing head gaskets (even thought he should have know better) I bet its piston hitting the head. That or tappets.

 

Didn’t vw send out a memo saying the head gaskets were no longer req. I think I read that on here once.

 

Highest output type 4 was 100bhp , 2 lt high comp pistons ,cam , FI and Porsche 2 lt heads

 

Yes, but you need to compensate with a spacer at the other end of the cylinder

 

It was a fix to particular problem - piston seizing and as he said it required base shim. but most only read as far as "remove head gasket" .

 

I’ve got a 2056 with a mild cam and twin IDF40s and a 123 distributor. It makes 85bhp according to the rolling road it went on but what mattered more to me was much wider power band starting a lower revs and same for torque so it’s a nice bus engine. Interesting to find out what is the issue with Razzyh one

 

Technical Bulletin 10-90 T01
________________________________________

Subject: VWC Remanufactured 2.0l Air-Cooled Engine Group: 10
Number: 10-90 T01
Models(s): Type II/Vanagon 1975 - 83 MY Date: May 31, 1990
________________________________________

Engines, P/N 071 100 031AX, 039 100 031 B/C/DX, have been modified to improve heat transfer and increase durability. These changes affect Engine codes: GD, GE, and CV.

The following improvements have been introduced as of remanufactured Engine number 89000.

To eliminate seizing of pistons, increased piston/cylinder clearance from 0.03mm ± 0.008mm to 0.045mm ± 0.005mm.

Eliminate aluminium seal 021 101 341A between cylinder and cylinder head.

Eliminate paper gasket 021 101 341A between foot of cylinder and crankcase.

Install 1.6mm aluminium shim 071 101 341, with adhesive D 000 400 at foot of cylinder to compensate for removed paper gasket and aluminium seal. Illustration 1.

To improve heat transfer, oil groves on both sides of the connecting rod to allow oil splash to cool bottom of the piston.

NB. The part number errors are in the original bulletin

 

This doesnt apply to CJ motors then?

 

Not if you keep strictly in accordance with the engines codes mentioned in the bulletin but as the CJ has, or potentially has the same piston heat problem the upgrades are still applicable IMO. CV, GE and GD are essentially the same 2.0l, 70 HP engines manufactured during the same time period as the CJ.

 

It seemed logical but worth asking. Cant see spacers on the bottom of mine (vega recon). Wonder what they did?