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We use the Allison engine starter, no clutch involved, Allison and turbine spin together without difficulty. When the Allison starts both spin together measuring the torque thru the torque transducer

All Allisons that operated during WW2 were rated on 100 octane fuel. 150 octane was not widely available if at all.. The engine demonstrated is a single stage supercharger 8.8to 1 ratio with a war emergency rating of 60"map with a maximumof 62" map at the test site 3000 RPM. The only Allison engine that would make 85"map would have been 2 stages of supercharging -109 or a P-63 engine needing water / alcohol injection to prevent detonation.

Hi Sandra. I am sorry but I have retired as of June 2023 and am no longer a player in the Allison field. Their are other parties that may be interested so try reaching out to them. Bud

Hi Bud, Glad to hear you are retiring, and thank you for your response. Glad to know there are others out there that have an interest in the big beautiful engines!@@BudWheeler

Have your Celius double it and add 30 is very close to what the Imperial Measurement is e.g 36C double add 30 ands you get close 100F

The test stand has a gearbox that is manufactured to accommodate both right-hand and left -hand Allison engines only. This is not a universal test stand for all types of engines it was manufactured only to test our Allison aircraft engines for installation for flight.

Good question. The engine is a V-12 with 4 valve per cylinder or 2 exhaust and 2 intake per cylinder, therefore the 2 exhaust stacks per cylinder. Very advanced stuff for 1943

Good question. Removing the F-nose or propeller gearbox and installing the E-nose adapter changes oil demand on the system. We installed a calibrated orfice on the main oil gallery to simulate the installing of the F-nose

I had read years ago, If my memory severs me?? if and if?? A turbo charger produces about 480 Hp and the super charger uses about 400 hp. So there was a slight dual increase in HP? Any knows this is not accurate do, Please correct this. As no offence taken.

@@edwardcarberry1095 The superchargers main job was not to increase HP but to MAINTAIN the HP as the plane went up in altitude where the air is thinner and needs more air pumped into the engine !! !

@@wilburfinnigan2142 Yes, I learnt that some 50 years ago.

joelHouser Because the M2500 Packard Marine was more powerful and more readily available, and designed as a PT Boat engine

My grandfather was in Darwin Australia during ww2 and recounted that when push came to shove the P40 pilots ignored the operating parameters and the Allison seemed to accept it.

@@watsisbuttndo829 The operating parameters were for prolonging engine lifespan more than they were hard points where failure could occur. Failure is more likely beyond the safe-operating limitations. But at no point in any aircraft does a manufacturer red line 2500rpm with the knowledge that at 2501rpm or even 2600rpm failure *will* occur. By 1941 anyway these engines were being produced like crazy and unhealthy or even destructive use of equipment meant absolutely nothing to the men using them for good reason.

The fuel and superchargers wouldn't allow for 70" on all but a VERY few variants. This one (-99) was rated just above 50" and 1360hp for war emergency power. Very few US engines were running anywhere near 70" even during late war, I think the P-47 N/Ms were around 72" but also generated around *2,800hp* at that pressure, which was similar for the F4U-5 but that didn't see combat.

The fuel octane was much higher for the high performance fighters in WW2. Believe it was 130 with up to 150 octane available. Wonder if this test was with todays 100LL?

The engine is an Allison V-12. It has 2 exhaust pipes per cylinder or 2 exhaust valves per cylinder as well as 2 intake valves per cylinder. Please look it up on wikpedia

@@aceallisons2639 Thank you very much - even just the appearance is impressive! 😃👍 I also like the sound of engines with many cylinders. 😉

@@u.e.u.e. Two intake and exhaust valves per cylinder is common on WW2 era V12 engines. This is not unique to the Allison. I mention it in the event you see the extra exhaust on other era engines.

@@sebclot9478 Thank you! 😃👍

You would get similar numbers.

A couple of thoughts. Our test stand is only for an Allison engine. A merlin would require a very different set up. Our torque transducer is rated for around 2400 Hp. Lots of numbers regarding horsepower bantered about( Example. 3900). I have been around and tested on a dyno these engines in many configurations and I can assure you they don't reach those numbers. Our stand is for testing Allison's for aviation use so I hope that helps you.

I think the torque figures are important here.

That is consumption at Maximum continuous power. Not cruise.

pcmacd ANYTHING that turns, rotates has to have a bearing to ride on !!! DUUUUUHH!!!!!!!!

God Yes,! Love the sound of engines. The little bit which I did , many years ago I was able to tell which aircraft was above by the sound of the /that engine although being the same engines. Loved it, the Gent which I worked for was "GREAT"! HE WAS WONDERFUL.!

jp-um2fr These Allison V1710 engines out grunted the 20 series and earlier Merlins as they were in case you did not know all also SINGLE stage supercharged, it was only the 60 series Merlin early 1943 that had the LATER, get that LATER newer 2 stage supercharger, they added a second compressor wheel to the supercharger and added a 2 speed gear box to turn the compressor FASTER at altitude. there were over 40 different models of Merlins produced throughout the war and most all dummies want to compare the LATE model 60 series as if ALL merlins were as such. and to compare the later merlins to the Allisons. That why the Allison Mustangs Mk I & II or P51A's would out run the later P51B/C'&D/K below 20,000 ft. the Allisons supercharger was tuned to the low med altitude the Merlin to High altitude. Those same early Allison Mustangs were also faster than the then current production $hitfire Mk V's with their single stage superchargers also and by 30 MPH !!!! The Allison did NOT get a later 2 stage supercharger because some dumb @$$ army brass thought the turbocharger was the answer but except for the P38 no room for the large turbo. It would have been nice IF the Allison would have gotten a 2 stage supercharger like so many other engines got. The Merlin the PW R1820's & the R2800's