Custom blended trumpet base - advice!

spend · Post by **spend** » Wed Jan 28, 2009 10:10 am

Eliot wrote:No way you could you fill those holes up with weld - you wouldn't be able to get the torch in there (I can weld ally and had considered it).

Funny if it can't be done that I have a couple

Grind out one side and fill, then the lower drain holes just need a blob

Eliot wrote:The base has to be machined out from 37mm to 44mm - that has to be done on a milling machine. The flaring tool I made myself for my blended trumpet base - first time I've used it on ally - it seemed to work ok.

44mm is the limit due to lengthwise restrictions IIRC, you can achieve nearly 50mm width wise, hence my point about the limitations of thinking circular and milling

The 3d bend in the manifold is also very limiting as to how deep you can go, the milling should probably be done at angles to flow into the manifold as well.. Hence my suggestion that it is easier to grind the base + manifold out without the geometrical limitations of the tooling IYSWIM.

topcatcustom · Post by **topcatcustom** » Wed Jan 28, 2009 10:22 am

No chance that the whole thing would banana by filling big holes on the top half with weld???

Eliot · Post by **Eliot** » Wed Jan 28, 2009 11:03 am

Ive taken your particular one out to 45mm.

chodjinn · Post by **chodjinn** » Wed Jan 28, 2009 11:07 am

Eliot wrote:Ive taken your particular one out to 45mm.

thanks for confirmation.

Spend, we're not touching the manifold as it's a kosher Taraka 45mm ported item so doesn't need any work. The reason we (well, Eliot) are doing this to a standard trumpet base is that I am selling my ACT carbon plenum, and the trumpet base is going with that. Hence why it has been ported to 45mm. Additionally I'll be getting a custom plenum made using a similar adapter-to-trumpet base that the ACT kit uses. Basically I'm combining two aftermarket plenum designs I've seen.

cheers

Eliot · Post by **Eliot** » Wed Jan 28, 2009 11:08 am

spend wrote:
Eliot wrote:No way you could you fill those holes up with weld - you wouldn't be able to get the torch in there (I can weld ally and had considered it).
Funny if it can't be done that I have a couple Grind out one side and fill, then the lower drain holes just need a blob

Yes I suppose if i ground the sides away I could get access for the torch - but it you could end up with quite a big mess also.
As you say, making a new billett one would be easier - but were getting even further away from a "simple" upgrade. And I'm not sure the benefits are worth the effort.

chodjinn · Post by **chodjinn** » Wed Jan 28, 2009 11:14 am

or the cost, esp. with that Devcon lol

Eliot · Post by **Eliot** » Sun Feb 01, 2009 9:58 pm

All done - that Devcon is good stuff.

Cleaned and roughed up:

Uh-oh - is this going to work:

Came out well:

That devcon is good, rock-hard and sticks well.

I'm going to be starting on some 71mm plenum's soon also.

chodjinn · Post by **chodjinn** » Mon Feb 02, 2009 9:19 am

Wow that looks amazing Eliot! Just the thing to put a smile on my face after a heavy b-day weekend and 3 inches of snow this morning! Will PM you.

How much of that Devcon is there left? Think it would be any good for blocking up a hole or two in the trumpet base (I only need a vac take-off) or would it be better to just get a bung to fill the servo hole etc?

topcatcustom · Post by **topcatcustom** » Mon Feb 02, 2009 9:44 am

Personally Olly I'd bung it- if you ever need another take off.... you know what I'm saying!

Looks good Elliot, how did you clean it up so well?

Wotland · Post by **Wotland** » Mon Feb 02, 2009 10:15 am

Simply perfect

.

Do you know if DEVCON is suitable to modify head inlet port ?

chodjinn · Post by **chodjinn** » Mon Feb 02, 2009 10:20 am

I think Eliot used some fancy solvent/alcohol based things to clean it up properly - think he mentioned it in this thread somewhere.

Wotland - I assume the Devcon could be used for heads - are you thinking for the Buick 300s? Only thing is that the heads will get a bit hotter than the plenum I would have thought, but the Devcon is rated to quite high temps IIRC.

Only problem is it is very expensive - £44 for 500g - but if it works, then it's worth it! I can start designing my plenum now, yay!

As for bungs for the trumpet base, anyone know what thread size they are, or even better have any bungs?!

cheers

Eliot · Post by **Eliot** » Mon Feb 02, 2009 11:38 am

Tell me what you want bunging up and i will make it on the lathe (as long as i get to keep the remaining devon-5!)

Eliot · Post by **Eliot** » Mon Feb 02, 2009 11:45 am

topcatproduction wrote: Looks good Elliot, how did you clean it up so well?

I used tech-kleen:
http://www.astralcsl.com/product.do?product=38349
Its really good stuff, turns the oil to soapy goo - all water soluable.
Not sure whats in it, but you need to go easy with it - because it will disolve ally if you leave it on too long. Good on ally wheels too, stings your hands also.

Cleans up black death nicely too:
http://www.mez.co.uk/westfield/08230002.JPG

I buy it in 25L barrels!

chodjinn · Post by **chodjinn** » Mon Feb 02, 2009 11:56 am

Well from that photo there are 3 holes in the trumpet base - I only need two small vaccuum take-offs (one for the Megasquirt MAP sensor and one for the Dump Valve/Boost Control). So ideally it would be one bung and two other bungs with a small 4-5mm vac pipe attached. That possible?

Haha I have no need for that Devcon stuff Eliot - it'll prob be more use to you mate!

ian.stewart · Post by **ian.stewart** » Mon Feb 02, 2009 12:13 pm

When I worked for my old firm, we used Devcon for repairs on some of our jobs, the these were MoD jobs too, admitedly these were considered temp jobs, but they were rated by the MoD so it must be of a good standard.