Yes, it goes along and it's quieter than it was. I only need it for local journeys really, no hammering up the motorway or flooring it up steep hills required.
Sooo.... inspired by this thread, I thought I would try the solder down the plug hole method of checking deck... First thing I found was the solder I had purchased from eBay was a lot harder than I would have liked. No way was it going to squish to roughly half it's 3mm thickness without some help from the heat gun, which was tricky, as it goes from hard to molten drips very quickly... After a couple of goes it did work though... I only checked 1 and 4, which where 1.85 and 2.05 mm. this seemed a bit high to me, but I'm guessing there is piston rock in there as well... Does anyone know what sort of deck one would expect on a bog standard 1700 variant engine?
The stock head cc is 49.5cc. Now you need to measure the size of the piston dish. Then you can work out the CR, look up what CR VW designed, then make a decision. 2mm sounds too much, the pistons are quite long with a low pin height, I doubt they'd rock 0.5mm.
No idea but I would bet someone on Samba knows. I guess not a lot, 5cc tops? 2mm deck, 5cc dome, 49.5cc chambers, 66x90, 8.2:1 Same with 1.5mm deck 8.7:1. So what we learn is accurately measuring the deck is best.
Interesting. I have just found an old Haynes manual that quotes 8.2 :1, so it doesn't sound far out then. As this is just a temporary engine till I get the Scooby lump built, I am tempted to leave it at that. Although it wouldn't be much work to have a head of and measure it properly...
I made mine 94.1mm AA tell me their 103 /104's are 93.5mm I don't believe I measured 0.6mm out though they were fitted so maybe. In my dreams I find stock pin, stock pin height 102mm dished pistons in stock length barrels. They'd save a fair amount of machining costs, leave the heads in better shape and theoretically a 1mm approx copper ring would make up the deck.
Aha, the pin height is 34.6mm, not stock 35.5mm, so there's the other mm ish. Barrels 93.5 (AA) - 91.8 (stock) = 1.7mm Pin 35.5 (stock) - 34.6 (AA) = 0.9mm Total "extra" deck height = 2.6mm Though I'm led to believe stock no spacers would be approx 0.5mm deck so 2.6mm + 0.5mm = 3.1mm so at 3.5mm I'm still 0.4mm out from somewhere. I blame stroker builders.
This is fun. There is no such thing as a dished 103mm VW piston but... I can get 8, yes 8 x Chevvy 4.060" pistons with 12cc dishes for £150 + import duties. Pin dia is in inches but approx 23.5 could be reamed out to 24mm no doubt. Pin height is 36.17mm so I'd be 1.3mm wider engine. No problem. AA barrels would need shortening anyway. 12cc dish I could have 60cc chambers and low CR or even almost stock chambers. 4.060" = 103.124 so get the barrels honed a bit. 512g IIRC very similar weight. The only thing I don't know is the width of a chevvy (or for that matter VW) little end. https://www.ebay.co.uk/itm/NEW-SPEE...129521&hash=item58843ec2d3:g:ptQAAOSwKQ9aAyEG
Have you not got a copy https://books.google.com/books/about/Aircooled_VW_Engine_Interchange_Manual_T.html?id=PuhW4TC-U00C Google was letting me see most of the con rod section.. Sent from my SM-T580 using Tapatalk
When the yanks quote "compression height" I wonder what they mean as the give different numbers for different rod lengths as if it was a measurement from the top of the cylinder rather than the top of the piston.
I don’t know, compression height is the dimension from the centre of the pin to the top of the piston. Nowt to do with the rod.
