isn't the hole used to pump supplementary air into the fuel mixture - by popping a tappet into the hole it plugs it up?
I think it feeds air into the exhaust stream to ensure all the fuel is burnt thereby reducing emissions.
My 1700 engine had them. Its a 914 not 411/412. I too used 10mm screws with Allen heads and loctite thread lock
Zed is on the money!! There was an air pump that was run off an extra drive belt... This pumped air into the exhaust port supposedly lowering emissions... Apparently it didn't work too well!!
You've got it!! Although you might find that the threads in the head are stripped and you'll need to get the plugs from vwh!!
I'd like the cam followers please if you don't want to keep them for another use @MorkC68 - I have a secret project going in and need 12 more
Yes, I know they're knackered, its a non vw engine related secret project, although I'm using vw engine bits to make the secret project out of
Probably using the simple emissions reduction strategy of reducing the % of noxious fumes in the exhaust by diluting it with clean air. Completely pointless.
those followers were very odd, some flat, some concaved but definitely past there best by the look of it!
You should see the ones that have come out of TBRs donor engine Looks like someone has installed new hydraulic lifters on an old cam, lifter bases have blued, and the edge around the base has gone serrated and eaten into the cam Best not get onto the pitted pistons or the burnt out exhaust valve and seat
I had the chance to do a few bits and bobs this afternoon, labelled a few parts up and measured the crank journals - its not been ground at all & the bearings are standard sized according to the p/n on one of the big end bearing shells. From flywheel end journal: 60.02mm 59.97mm 60.02mm Middle journal 60.02mm 59.95mm (with signs of damage from a bearing dowel) 60.02mm Fan end - not measured yet, bearing still in place. Big end bearing journal diameters #3 - 55.04mm #1 - 55.02mm The dimensions measured are a bit up on Tom Wilson, I used UKAS calibrated measuring equipment - there is evidence of burnt oil in the case, maybe this is why there's a bit of difference Judging by these measurements, which if Im not mistaken show the crank to be at factory dimensions, I can go for a 0.25 regrind as that's the next size of bearing up in the Heritage list of bearings?
Yeah, 0.25 is the next size for a crank grind I think I've already mentioned that most of the engines that I've looked at recently are now at the point where cranks need grinding!!
Yep you did Paul, I must admit I was concerned initially I case it had several grinds already but I'm please it's to spec even though it is scored slightly!
