Man with spanners - thinks he's a mechanic

Need help from a fellow owner, something to air - discuss away!

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ChrisL
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Re: Man with spanners - thinks he's a mechanic

Postby ChrisL » Fri Feb 23, 2018 3:43 pm

Cheers Steve,

Re Lambda sensor:
I'd read the same page, which is where I got the 100cm from the header from, which is what I think I'll do. re the angle, the ust have some offset comes if its mounted in an enclosed space to stop heat buildup, will probably still off set, towards the car.

Re Decom plate, I think I won't bother as I'm only looking at 10-11 psi.
Asked on locost and had this response:
http://www.locostbuilders.co.uk/forum/v ... tid=209129
Yes I've been drinking, what of it!!

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ChrisL
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Re: Man with spanners - thinks he's a mechanic

Postby ChrisL » Sat Mar 10, 2018 4:32 pm

Some progress, after 2 colds finally got the alternator mounted. Supercharger next
AD8230CB-581E-4925-9EDB-49277CB09FB7.jpeg
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ChrisL
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Re: Man with spanners - thinks he's a mechanic

Postby ChrisL » Sat Mar 17, 2018 10:22 pm

Plenum coming along and started on the lambda sensor boss
CB776769-753F-4B37-9277-EF2D797DE665.jpeg
A7174AE5-F16B-4AF2-85E1-0EEDC6251DCB.jpeg
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Jay
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Re: Man with spanners - thinks he's a mechanic

Postby Jay » Sat Mar 17, 2018 10:38 pm

Well done on the progress Chris. Dont want this to come over wrong but if i were youi would get those welds looking at on the alternator bracket and definatley on the plenum, they are going to let you down. If the welds on the plenum give up the car is going to go lean and prob pop the engine.
Hope this helps in the long run

kenton
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Re: Man with spanners - thinks he's a mechanic

Postby kenton » Sun Mar 18, 2018 8:24 am

Love the "can do attitude" Chris. 8-)
Alternator bracket looks fine to me, I doubt they are even needed on the spacers.
Keep up the good work

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Tony T
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Re: Man with spanners - thinks he's a mechanic

Postby Tony T » Sun Mar 18, 2018 11:59 am

Jay wrote:Well done on the progress Chris. Dont want this to come over wrong but if i were youi would get those welds looking at on the alternator bracket and definatley on the plenum, they are going to let you down. If the welds on the plenum give up the car is going to go lean and prob pop the engine.
Hope this helps in the long run


yup i agree with jay.it's not easy to weld thin to thick material for a non experienced welder practice and more practice it looks like you'v got a row of big spot weld you need to try for one continues weld.it might leak air.nice attitude keep going :) :)


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b33fy
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Re: Man with spanners - thinks he's a mechanic

Postby b33fy » Sun Mar 18, 2018 12:14 pm

Well done for giving it a go Chris, not something I’d try and weld with my welding skills. As Tony and Jay said thick to thin metal is tricky, even harder doing circles. What sort of welder and gas are you using?
Power.. small nail, fast hammer, Torque.. small nail, big hammer.. I got a big hammer :P

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Fury1630
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Re: Man with spanners - thinks he's a mechanic

Postby Fury1630 » Sun Mar 18, 2018 5:28 pm

Your welding is a lot better than mine on the exhaust & that's lasted. Once the welding onto the plenum is done, fill it with water & see if it leaks. The joy of doing something like this yourself is you don't have to get it right first time. Even if you do the water test & it leaks like a sieve you can seal the holes with bathroom sealant, carry on & when you know it all works, then re-make a MkII with all the learning incorporated. Either your welding will be goon enough second time round or tack weld it together & get it professionally welded.

But it may not leak - my exhaust doesn't.

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DJ.
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Re: Man with spanners - thinks he's a mechanic

Postby DJ. » Sun Mar 18, 2018 7:11 pm

Fury1630 wrote:
But it may not leak - my exhaust doesn't.


My exhaust does and that was welded by someone for Caterham! Fortunately, it is after the lambda and catalyst so doesn't seem to affect anything :)

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ChrisL
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Re: Man with spanners - thinks he's a mechanic

Postby ChrisL » Mon Mar 19, 2018 8:44 am

Well that started a bit of debate!! The reason why the plenum looks like it's been spot welded is because it has, it's important not to put too much heat into the backplate otherwise it'll warp, in fact it has but not by very much.

TBH I prefer to weld this way as it give you more control and I'm happy that I have good penetration of both parts but time will tell....
Yes I've been drinking, what of it!!


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