Nick Jones Posted December 18, 2018 Posted December 18, 2018 So far so good. Feel you have set yourself a significant challenge with the twin plenums and common (twin) throttle body! Does mean nice long primaries though. Nick
Chippy63 Posted December 19, 2018 Author Posted December 19, 2018 It's a toss up Nick. Using the same twin throttle body as before I have already got cable and TPS and breathers sorted. The work saved using 2 single throttle bodies which I already have (rover 25's) and was going to put straight on the ends of the tubes is quite considerably especially the cable linkage to get balanced.
Chippy63 Posted December 23, 2018 Author Posted December 23, 2018 I have decided to weld the inlet tubes to the manifolds and only have silicone joints on the plenum tubes to inlet tubes. There would have been too many variables in geometry otherwise. I have them tacked up now.
Nick Jones Posted December 23, 2018 Posted December 23, 2018 Good decision I think. Too many variables, too many joints, too many leak opportunities......
Chippy63 Posted December 28, 2018 Author Posted December 28, 2018 Got all 8 tracks welded up and on to the throttle housing
Nick Jones Posted December 30, 2018 Posted December 30, 2018 That looks like a challenging weld or two coming up...... The plan is coming together though!
JohnD Posted December 30, 2018 Posted December 30, 2018 Very nice work, Chippy! Beautiful, even! I need to catch up on your project - you chose a double butterfly throttle, for no doubt good reasons. Now you have chosen to have what seems like a balance port between the two ducts, behind the butterfly. Why? To even out pulses from the intakes, balance ports closer to the valves would work better. Or do I misunderstand? John ( see elsewhere - permanent candidate for the Chair of Ignorance at Sideways U.!)
Nick Jones Posted December 30, 2018 Posted December 30, 2018 I think “Chair of insatiable curiosity” is kinder John........
Chippy63 Posted December 30, 2018 Author Posted December 30, 2018 3 hours ago, Nick Jones said: That looks like a challenging weld or two coming up...... The plan is coming together though! Yes Nick i was thinking the v in the middle of the tubes was going to be difficult so removed the plate from its tacks and have added a fillet of filler rod, should be a lot easier now. All the large tubes are actually a lot easier than the small ones. The cast to polished flows lovely. Cheers Steve
Chippy63 Posted December 30, 2018 Author Posted December 30, 2018 2 hours ago, JohnD said: Very nice work, Chippy! Beautiful, even! I need to catch up on your project - you chose a double butterfly throttle, for no doubt good reasons. Now you have chosen to have what seems like a balance port between the two ducts, behind the butterfly. Why? To even out pulses from the intakes, balance ports closer to the valves would work better. Or do I misunderstand? John ( see elsewhere - permanent candidate for the Chair of Ignorance at Sideways U.!) John the use of the twin throttle is down to the shape lending itself to pick up 2 tubes behind the mounting also it is proven on my first manifold and also it has a really well engineered exponetial throttle mechanisms that gives good low down control. As for the balance hole that is more to do with fitting on the back plate and lining up the ports but if it balances a bit all the better. I will be linking the rears of the plenum tube with fairly large tubes with a vacùm take off box in the middle so hopfully that will also balance things. Cheers Steve
JohnD Posted December 30, 2018 Posted December 30, 2018 Ahhhhhhhhhh! I see your thinking now. Thanks, Steve! I'll look forward to progress! In my limited experience, getting a welded fabrication leakproof is difficult, but that was for coolant. I wished then that I had a hot enough torch to braze, as that should flow better to seal. I had assumed that TIG would be another better method, but recent Project Binky episodes have shown that even in the hands of a divvy like Niock Blackhurst, that ain't necessarily so! John
Chippy63 Posted December 30, 2018 Author Posted December 30, 2018 42 minutes ago, JohnD said: Ahhhhhhhhhh! I see your thinking now. Thanks, Steve! I'll look forward to progress! In my limited experience, getting a welded fabrication leakproof is difficult, but that was for coolant. I wished then that I had a hot enough torch to braze, as that should flow better to seal. I had assumed that TIG would be another better method, but recent Project Binky episodes have shown that even in the hands of a divvy like Niock Blackhurst, that ain't necessarily so! John Not had any experience with brazing John but starting to get to grips with the hundreds of variables associated with tig welding aluminium. I could probably knock up a list of 20 checks before you even attempt to fire up the welder. As my mate says to me " failing to prepare is prepareing to fail" Steve
Nick Jones Posted December 30, 2018 Posted December 30, 2018 Lumiweld is brazing for aluminium and gives pretty good results. A MAP gas torch will almost certainly be enough for lumiweld and even for smaller conventional brazing work. TIG welding should be better in the hands of moderately competent operator (which rules me out) and it is much less prone to gaps and porosity than MIG which can leak like a shower head even when the weld looks good.
JohnD Posted December 30, 2018 Posted December 30, 2018 That WAS my MiG experience, Nick! Endless grinding back, re-welding and re-testing! That even Nick Blackhurst gets leaks makes me feel better! "Lumiweld". Hmmmm! very cheap from Frost: https://www.frost.co.uk/lumiweld-kits.html I had a go with an instructor's TiG at college, (he set it up for me, Steve!) and was blown away by it's potential. I have learnt gas welding (Level 1 C&G, no less!) and it's much more like that than MiG. John
Chippy63 Posted December 30, 2018 Author Posted December 30, 2018 1 hour ago, JohnD said: That WAS my MiG experience, Nick! Endless grinding back, re-welding and re-testing! That even Nick Blackhurst gets leaks makes me feel better! "Lumiweld". Hmmmm! very cheap from Frost: https://www.frost.co.uk/lumiweld-kits.html I had a go with an instructor's TiG at college, (he set it up for me, Steve!) and was blown away by it's potential. I have learnt gas welding (Level 1 C&G, no less!) and it's much more like that than MiG. John Tig can be so rewarding and so frustrating, in the same day for me usually. I'm lucky to have a good friend who has helped me get to grips with a lot of it. He is a superb welder and is pipework certified where his work gets xrayed for inclusions and pourosity. Like anything to get off the bottom run of it requires a fair investment. I've got a £1200 tig and then 2 x 20L bottles of argon. And many hundreds of pounds of consumables. But hay I don't smoke or drink to excess Steve
Chippy63 Posted January 1, 2019 Author Posted January 1, 2019 Throttle housing finished. On to the cam cover modifications
Nick Jones Posted January 1, 2019 Posted January 1, 2019 Oh yes......! Cam cover mods are support brackets for the plenums presumably?
Chippy63 Posted January 1, 2019 Author Posted January 1, 2019 1 hour ago, Nick Jones said: Oh yes......! Cam cover mods are support brackets for the plenums presumably? Yes Nick and supports for the throttle housing and coil packs. Also plug off the single breather at the back of one of them and add 2 breathers to the fronts. Think I'll have them powder coated after that.
Chippy63 Posted January 2, 2019 Author Posted January 2, 2019 Found a 17/32" drill bit from my last manifold build so got the fuel rails sorted.
Chippy63 Posted January 2, 2019 Author Posted January 2, 2019 Cam covers plugged up and coil mounts stamped out.
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