April 28, 201115 yr comment_520111 This is a stupid tangent but can you buy that sand mould stuff that manufacturers use to make parts from, cause if you could design the head and get the right parts cnc'd you could go down that road.....crazy stupid and expensive i know.....just a thought Report
April 28, 201115 yr Author comment_520130 No. You got it wrong. In the first instance I just want to match the head of a different engine to the 3K. As a side project I am looking to make something more intricate like a whole block or head...but that is a bit more long term. Report
April 28, 201115 yr comment_520209 Sand casting is definitely the easiest option, if you have access to a cnc, you machine up the pattern. Or, even better, with the cost of 3d printing coming right down you could have a pattern printed. Even wax printed and investment cast wouldn't be out of the question. Considering fitting a head to a different block requires relocating head bolts, water jacket ports, cam guides, oil feeds etc, and that's before you look at combustion chamber suitability, I still maintain the cast head is the easier option. Report
April 28, 201115 yr comment_520273 I sat an old head gasket from a 4afe on top of a 5k block at one time. The bore spacing of a 5k is pretty much identical to 4A series motors. Report
April 28, 201115 yr Author comment_520284 Hi Philbey Water and Oil line up, just need a slight reshape. Cam and combustion (imagine you mean cc head and clearancing pistons rather than shape and squish)...always expected to have to do that. Also need to update oil pump to cope with likely more revs. Which raises another question, anyone know how realiable the std crank is? What kind of revs can it handle? Report
April 29, 201115 yr comment_520348 Theoretically the bottom end is a little behind when it comes to a high revving reliable design. It only has a partially counter balanced crank and the block is not of a deep skirt design which means that ideally you would want some extra support for the bearing caps. If you look at modern high revving reliable engines you'll find they have either a complete bearing cradle attached to the caps, or a cast sump that forms the bearing caps to completely secure the bottom end. Other than that the K motors have pretty reasonable rods and bolts which is a definite plus. People seem to get away with big revs out of them, but they aren't really designed for it and longevity may be an issue. Report
April 29, 201115 yr comment_520423 the guys that raced the ke10's from the factory stated a 8500 redline iirc stock bottom end. Report
April 29, 201115 yr comment_520429 Yeah a stock 5k bottom end survived 8000rpm for a number of years, so I guess that would be so. Report
April 30, 201115 yr comment_520588 Bore spacing center to cente on both my 4 and 5k is 90mm Close as I could get with "very near calipers". Stu. Report
May 1, 201115 yr comment_520832 There was a Bloke in Shepparton that rallyed a 3k with some strange head. Report
May 1, 201115 yr comment_520856 There was a Bloke in Shepparton that rallyed a 3k with some strange head. was it this guy? ohhhh, the engine had a strange head..... :blush: Report
May 2, 201115 yr Author comment_521024 ROFLMAO. Love it. On a more serious note. Does anyone know where, or have available some CAD drawings of an existing twincam head? I have sourced some software to make relevant templates and have them made up, but I don't have a base design. Any help/direction appreciated. Report
May 2, 201115 yr comment_521107 On a more serious note. Does anyone know where, or have available some CAD drawings of an existing twincam head? I have sourced some software to make relevant templates and have them made up, but I don't have a base design. Any help/direction appreciated. waggott made a twin cam head for a Holden six(from memory was a red motor) and also the KAD unit for early a series mini. You may be able to dig up some tech drawings on the net or try the mini or early Holden forums. My mates KAD head is off getting fixed but I'd be able to get a few pics for you when it's done. I know they would probably be a bit iffy on passing on too much info but bullet cylinders heads make billet twin cam heads. They might be worth getting in contact with. Stu. Report
May 2, 201115 yr comment_521120 waggot also made a four cylinder engine with a twin cam head too. I can scratch up some old details in print, but can't find too much online... found this too... wtf turns out from Lancia triflux 16v Edited May 2, 201115 yr by TE278U Report
May 2, 201115 yr comment_521137 Holy crap! How the hell does that work? Also, if someone does have more info about the Waggott heads I'd be really curious :) Report
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