ALLISON HELP

BAJ · **Joined:** Wed Jan 25, 2012 3:14 pm **Posts:** 126

Hi Guys,

We have a single Allison V12 engine here at the HARS Museum at Albion Park, Wollongong, Australia.

Its data plate shows:

Acceptance date: 1/31/1942 or 31st January 1942

Serial # 42-33999

Manufacture #9684

Compression Ratio 6.65:1

Blower Ratio 8.8:1

Model B1710-39

We are pretty sure it was in a Kittyhawk but would appreciate any feedback on who manufacturer 9684 was and what actual aircraft it may have been fitted in.

We picked it up of a farm about 3yrs ago where it had been out in a field under some sheets of tin for about 20yrs

The Inspector · **Posted:** Sun Aug 05, 2012 8:27 am

The -39 is an early series engine and was rated @ right around 1000 H.P. To find out more specific info about your motor check into these books; 'VEE' for Victory by Daniel Whitney, and Allied Piston Engines of World War two by Graham White for model specific installations. If the engine has the tapering inline prop reduction gearbox then the chances are pretty good you have a KITTYHAWK engine as later series and the ones in P-39's used a 'VEE' type prop reduction drive. Keep us posted!

Randy Wilson · **Posted:** Sun Aug 05, 2012 10:36 am

From the references noted by The Inspector, the V-1710-39 (F3R) engine was used in the NAA F-6A, Curtiss P-40D/E, Curtiss XP-46 and NAA XP-51A/P-51A. It was rated at 1150 h.p. at 3,000 r.p.m. from sea level to 11,800 feet. Earlier versions of the P-40B/C/E/G used the -33 (C15) engine. The C-series engines had the longer nose case housing the propellor reduction gearing. The F-series used a different reduction gear that shortened the nose of the engine and raised the propellor shaft. Hope that is of some help.

Randy

BAJ · **Joined:** Wed Jan 25, 2012 3:14 pm **Posts:** 126

Thanks Guys....any thoughts on who Manufacturer # 9684 was?

BAJ · **Joined:** Wed Jan 25, 2012 3:14 pm **Posts:** 126

[url]Heres a photo of it pre-restoration.........http://www.google.com.au/imgres?q=hars+ ... 0,s:0,i:73[/url]

The Inspector · **Posted:** Mon Aug 06, 2012 9:08 am

Do you have a good, clear shot of the data plate? That engine either was modified by someone or it's a later series as it's got the 'VEE' type propeller reduction gearbox instead of the early inline planetary type.
It looks pretty complete and you may save some possible agony by just giving it a really good pressure washing and lots of SCOTCHBRITE and rubber glove action followed by a good Tiajuana Overhaul (repainting the engine) it's a basic engine requiring only a number of hand tools but there are some things that require care and awareness of like the bottom nut on the intake log and how to get to it (how many extensions do you have). Keep us posted.

Invader26 · **Joined:** Wed Aug 11, 2010 7:56 am **Posts:** 843

I like HARS calling the Bell Huey Cobra an "Apache"....

Randy Wilson · **Posted:** Mon Aug 06, 2012 3:54 pm

BAJ wrote:

Thanks Guys....any thoughts on who Manufacturer # 9684 was?

In your original post you have "Manufacture #" and not "Manufacturer #". If the first is correct, I think this was the number Allison gave to the particular engine. I'm not an expert on V-1710 engines but I'm sure someone here knows the answer.

Randy

The Inspector · **Posted:** Mon Aug 06, 2012 5:57 pm

Randy Wilson wrote:

BAJ wrote:

Thanks Guys....any thoughts on who Manufacturer # 9684 was?

In your original post you have "Manufacture #" and not "Manufacturer #". If the first is correct, I think this was the number Allison gave to the particular engine. I'm not an expert on V-1710 engines but I'm sure someone here knows the answer.

Randy

If 9684 is the series serial number then it's really early as ALLISON built just North of 70,000 V-1710's

BAJ · **Joined:** Wed Jan 25, 2012 3:14 pm **Posts:** 126

Thanks guys ...excellent info so far

BAJ · **Joined:** Wed Jan 25, 2012 3:14 pm **Posts:** 126

Invader26 wrote:

I like HARS calling the Bell Huey Cobra an "Apache"....

Not me !!!!....but happy to organise to get it fixed. Is that on the Web site? :lol: :lol:

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