jeffw
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| posted on 1/2/17 at 10:45 AM |
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GTiR Plenum backplate in billet
My new billet plenum backplate has arrived. Think it looks rather nice
[Edited on 1/2/17 by jeffw]
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Dick
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| posted on 1/2/17 at 12:02 PM |
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Looks very nice if I must say so myself
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jeffw
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| posted on 1/2/17 at 12:11 PM |
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Thanks to Dick
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bi22le
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| posted on 1/2/17 at 12:49 PM |
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Is this going to have trumpets going through as the inlet mouths are not turned.
I can see that you have rubber o rings to seal it so I cant work out how your are going to smooth the air flow into the ITBs.
Track days ARE the best thing since sliced bread, until I get a supercharger that is!
Please read my ring story:
http://www.locostbuilders.co.uk/forum/13/viewthread.php?tid=139152&page=1
Me doing a sub 56sec lap around Brands Indy. I need a geo set up! http://www.youtube.com/watch?v=EHksfvIGB3I
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jeffw
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| posted on 1/2/17 at 12:55 PM |
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19mm trumpets as before with the other backing plate
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jeffw
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| posted on 1/2/17 at 01:15 PM |
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although you don't actually need them with forced induction. A number of big power cars don't use trumpets in their plenums
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Dick
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| posted on 1/2/17 at 03:38 PM |
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The o ring are to seal the back plate to the throttle bodies as jeff and I both think we need to ensure that no boost pressure is lost, the bore of
the plate is an exact fit to the throttle bodied so no step is present so its just like the throttle bodies are a bit longer, the trumpets are also
and exact fit so its the trumpet length plus the plate thickness onto the original itb's. If you run your finger over the joints you can feel
the joint but cant detect any step
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CNHSS1
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| posted on 1/2/17 at 03:51 PM |
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*cough* big tart Jeff *cough* 
Craig
"Racing is life, everything else, before or after, is just waiting"---Steve McQueen
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richardm6994
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| posted on 1/2/17 at 04:36 PM |
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Very nice indeed jeff!
May I ask what depth you've gone for on the internal step to increase volume plenum?.
I think you've already seen my efforts on here and facebook (the blue charger on the silvertop zetec) and I went for a 16mm depth, but yet to
see what the rolling road results are like.
I'm currently planning another one now for an ST170 engine in a GBS zero. This time however I'll be machining with bell mouthed / trumpet
shaped inlet holes.
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jeffw
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| posted on 1/2/17 at 04:42 PM |
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quote:
Originally posted by CNHSS1
*cough* big tart Jeff *cough*
Craig
I'll be having words later ...
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jeffw
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| posted on 1/2/17 at 04:44 PM |
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quote:
Originally posted by richardm6994
Very nice indeed jeff!
May I ask what depth you've gone for on the internal step to increase volume plenum?.
I think you've already seen my efforts on here and facebook (the blue charger on the silvertop zetec) and I went for a 16mm depth, but yet to
see what the rolling road results are like.
I'm currently planning another one now for an ST170 engine in a GBS zero. This time however I'll be machining with bell mouthed / trumpet
shaped inlet holes.
Your efforts are always interesting and well done. The step is 10mm from memory but could be much larger but at the expense of machining a very large
billet to get the increase depth.
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richardm6994
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| posted on 1/2/17 at 05:02 PM |
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Thanks Jeff,
The billet isn't too expensive, I think the piece I used on the blue charger was about £20 and the thicker one (to allow for the bell mouths)
I'll be using for the ST engine will be about £30........only downside to these is loads of bl00dy swarf everywhere!!
They polish up nice though!
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CNHSS1
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| posted on 1/2/17 at 05:55 PM |
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Anything billet is worth 10 pit-pose points and .2s on the track for sure
"Racing is life, everything else, before or after, is just waiting"---Steve McQueen
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jeffw
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| posted on 1/2/17 at 06:22 PM |
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lol
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SPYDER
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| posted on 1/2/17 at 07:44 PM |
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Nice work. I'd have put pockets in between the holes on the back for lightening. And even more bling! I might even have tried machining integral
bellmouths!
I did 20 years in CNC machining but haven't done any for a while. Its highly satisfying turning a blank into something like your plenum.
I've even considered buying a small machine for the garage.
Now where are those roller barrel throttle sketches...?
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richardm6994
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| posted on 1/2/17 at 08:18 PM |
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CNC = LOL 😀
The trick is machining stuff the old fashion way and people thinking it's been done by CNC.
For the intergrated bell mouths I'm doing on this latest gtir back plate, I'm machining a bespoke cutter to make sure the bells are all
the same shape and size. This in itself is hours of work but a lot more satisfying than g-code (which I have to do from time to time at work) or
catia.
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jeffw
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| posted on 1/2/17 at 08:38 PM |
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Much as I enjoy a bit of CNC billet it is about going faster and not really about looking good, although the new body kit will do that (and
shocks/wheels !)
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jambojeef
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| posted on 1/2/17 at 09:40 PM |
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http://www.profblairandassociates.com/pdfs/RET_Bellmouth_Sept.pdf
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nick205
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| posted on 2/2/17 at 11:04 AM |
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quote:
Originally posted by richardm6994
........only downside to these is loads of bl00dy swarf everywhere!!
True - clearing up the swarf can be hard work!
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SPYDER
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| posted on 2/2/17 at 04:09 PM |
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quote:
Originally posted by nick205
True - clearing up the swarf can be hard work!
In my last job we machined some "swing wing" hinge prototypes from the largest ally billets I have ever encountered.
The largest was about five feet by three feet by about 18 inches. We had to modify the bed with indexing pins so that we could move the billet
along.
Ninety five percent of it was reduced to swarf. This was on an open machine too.
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jeffw
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| posted on 4/2/17 at 12:18 PM |
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On the car...
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gaz_gaz
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| posted on 4/2/17 at 01:53 PM |
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Very nice..
Did you build the car from scratch Jeff or did you buy and modify modify modify?
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jeffw
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| posted on 4/2/17 at 03:02 PM |
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Bought it about 10 years ago with a Silver Top on carbs....changed a bit since then
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richardm6994
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| posted on 13/4/17 at 09:44 AM |
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Here is my home made effort now it's finished. Started out as a 30mm thick ali plate.
The bell mouths have turned out alright as well.
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jeffw
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| posted on 13/4/17 at 09:54 AM |
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That's cool as well. Nice job.
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