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Old 22-05-2020, 03:40 PM   #1
ShepWoofWoof
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Default Missing tinware...do I need it?

So, the ongoing saga of the rebuild of Type 4, 2ltr CU engine. Turns out I've 2 pieces of tinware missing. Basically looking for reassurance that I can live without, as I don't think they are critical bits, but I know other bits are super important..

The 2 missing pieces are the ones that sit below the push rod tubes on each side of the engine (NOT between the PR Tubes and the cylinders - I know those are vital!)

The unusual thing here is that the Heat Exchangers have been swapped out for J-Tubes if that makes a difference.

I know these bits are super hard (and expensive) to find, so just hoping I can save a tonne of hassle on this bit, especially given that the engine seems to have been running OK without them for the last 10 years!

Thoughts appreciated in advance.
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Old 22-05-2020, 04:10 PM   #2
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I wouldn't be happy to run with any part of the tinware missing. Those bottom tins direct the air flow, once past the cylinders, to escape as efficiently as possible. Even the outer shell of the heat exchangers forms part of the design of the cooling tinware, so if the H/Es have been replaced by J tubes, that too needs to be considered.
My mate's car which has J-tubes would regularly run hotter than he liked, so we fabricated a pair of bottom tins (just from sheet steel), with an extension at the side, to close the gap left by removal of the heat exchangers, (similar to the design of early "non-fresh-air" heater boxes). All the waste hot air is now channelled away to the rear, to escape cleanly. Can't prove how effective this is, and it may just be coincidence, but, haven't had any overheating problems since fitting these.
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Old 22-05-2020, 08:15 PM   #3
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Originally Posted by Bada Ben View Post
I wouldn't be happy to run with any part of the tinware missing. Those bottom tins direct the air flow, once past the cylinders, to escape as efficiently as possible. Even the outer shell of the heat exchangers forms part of the design of the cooling tinware, so if the H/Es have been replaced by J tubes, that too needs to be considered.
My mate's car which has J-tubes would regularly run hotter than he liked, so we fabricated a pair of bottom tins (just from sheet steel), with an extension at the side, to close the gap left by removal of the heat exchangers, (similar to the design of early "non-fresh-air" heater boxes). All the waste hot air is now channelled away to the rear, to escape cleanly. Can't prove how effective this is, and it may just be coincidence, but, haven't had any overheating problems since fitting these.
Thanks for your thoughts. Fabrication is an option, in fact, I suspect it may be the best one! But your right, difficult to know how effective it would be.

Any danger of getting some photos of your mates set up?
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Old 22-05-2020, 09:09 PM   #4
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Any danger of getting some photos of your mates set up?
I'll ask him.
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Old 22-05-2020, 11:14 PM   #5
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Look at it this way, if it wasn't necessary VW wouldn't have fitted it.
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Old 25-05-2020, 11:48 AM   #6
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If you have j tubes and not exchangers I wiukd guess your increasing heat in that area. I personally would put something there be it original or home made just to help direct the air where it was designed to go.
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