40H carbs?

[Aeroliner]

I have reviewed my parts catalogue dated 1961 and it shows that the KG-4 had an AJ-36 while the KG-7 had an AL-32. When Mercury introduced the Mark 20-H they also introduced a block kit to convert the KG-7 to a KG-4. At this point the AJ-32 became legal for the KG-4.

Alan

[Ron Hill]

AJ 29 A might have been a KE-7 or even a KE-4 carb. By the time I started racing "A" in 1955, no one used the AJ 29 A carbs.

The 32 you say is in the 1961 catalog, is that the same as the 30-H????Or was that a Mark 15-Mark 20 carb.

I still didn't see the bleed hole on the Mark 40 carb picture......

Cool stuff anyway.....

[Ron Hill]

Couldn't find that thread. However, I confirmed my belief by looking at my parts books that the AJ29A was on KF7's which were the Super 10's. AJ36A were the carbs on the KG4's. The KG4H's even came with the 36A but eventually the 32A which was on KG7's were allowed.

The 32A's were allowed when the 20H came out which obsoleted the KG7H, so Merc came out with a kit comprised of block & pistons to convert KG7H's to KG4's for racing. Perhaps the confusion on the thread is a result of the KG7 to KG4 kit was actually installed on a KF7 with the 29A carb.

John

John Schubert

[Aeroliner]

Hi Ron,
If you look at the -15 plug and where it goes you will see about a 1/8 in hole in the boss just right of the plug boss. It is a real small hole, might be .090 inches.

Alan

[Ron Hill]

But only on the Mark 40's???

[Aeroliner]

I will have to check the other engines tomorrow. This was the first place I found it when we were restoring the engines. My first thought was that someone had messed with the carbs but the parts book showed that it was a standard feature.

Alan

[Ron Hill]

The legal carbs for the KG4 were AJ29A, AJ32A, AJ40A. The AJ32A was popular for the KG4. I don't have any records on the KG7, but think it also used the AJ32A.

I asked Dick O'Dea what he remembered....I never heard of an AJ 40....

[Ron Hill]

Ron, They were both Tilitson (Sp) but I don't remember the numbers and letters. The KG-7 had a much bigger venturi than the KG-4. Doug Lund at Alexandria Marine in Alexandria, VA has the manuals on most of the old motors. They would give the correct numbers and letters. So they would be under KG-4H, and KG-7H, I think.

FYI:

Major Bob had a higher ranking than Major, but we always called him "Major Bob". He grew up in Ohio and raced with Jon Culver and Dean Chenowith.
I figurd he might remember carbs as he remembers when Culver ran the first 8 reed reed block...

[Schiada]

How about this??

[Schiada]

Red aero.