Back in my crazy late teen life a buddy and I knew this stock car racer and he gave us some aviation fuel to put in our Harley Davidson motorcycles and it sure gave us more power and would blow out all the black carbon. thanks for video.
It may have only made a few more HP, but the exhaust smell is worth it. Nothing like AV Gas or Racing Fuel. Nice looking old 630, we had a 730 Diesel back in the late 80’s. It was an awesome starting and running tractor if you had good batteries, if not, leave it in the barn. Big step going to the 4020 Diesel Powershift. Thanks for the videos.
I believe the reason for the increase in performance, is due to the high volatility of the 87 octane in the long stroke JD 2 cylinder design. The 87 octane explosion is very fast and combustion is completed before the end of the power stroke is completed. VS the high octane AV gas slower explosion which allows combustion to occur at a point in the power stroke to maximize power output. It is not that the AV gas higher octane is making the power it is the slower explosion. Now if you tried this test in a short stroke large bore engine the results would be the achieve opposite result. Nice test, and that 630 looks and sounds great. ❤
Way to cover all the bases, define octane, say that is the reason for the performance increase then immediately turn around and say it isn't the reason for the performance increase. Especially when a single variable was changed. Unless perhaps you think he might have increased the engines compression as easily as it's fuel ...
Perhaps 'requirements' is correct but an engine is capable of making more power with more spark advance while using av gas. I know this first hand from a slightly better than stock built 283.
You do realize that when that tractor was made there was regular leaded gas. It had a little higher octane than the unleaded of today. Not as much as aviation fuel, but the higher octane will make more power because the motor was made to run on a higher octane than the gas of today
@@shortytari Lead does mean anything different about the fuel performance in combustion. Uneducated people today think if they run 93 octane in a vehicle that clearly says to use 87 regular, that their vehicle will run better with more power. Hahahahahaha
@jakepeters5814 I understand, I've been head Mechanic at a Ford Dealership for 27 years, and we get so man people coming in saying their vehicles are running ruff and knocking, we're talking dozens a month. The first thing I usually ask is what octane fuel are you using. If they say 93, I tell them your Vehicle is designed to run on 87. 9 out of 10 times, it fixes the problem after switching back to 87 regular.
@@jakepeters5814 I understand that. Just pointing out that when it was made the engineers designed it to run on the fuel available at the time, which was a little higher in octane than the fuel of today. Lower octane in an engine that was not designed for it will naturally produce less power than a higher octane fuel. aviation fuel is the extreme. It would take more compression and a little more timing advance to get the most out of that fuel, but it will still make a little more power because it meets the requirement of the motor
Aviation gas the 100octane LL. Low lead for a 60 year old tractor probably not a bad idea but i would not use it undiluted a good mix is 50/50.. do not use alcohol gas.
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Back in my crazy late teen life a buddy and I knew this stock car racer and he gave us some aviation fuel to put
in our Harley Davidson motorcycles and it sure gave us more power and would blow out all the black carbon. thanks for video.
It may have only made a few more HP, but the exhaust smell is worth it. Nothing like AV Gas or Racing Fuel. Nice looking old 630, we had a 730 Diesel back in the late 80’s. It was an awesome starting and running tractor if you had good batteries, if not, leave it in the barn. Big step going to the 4020 Diesel Powershift. Thanks for the videos.
AV gas does have a 15+ yr shelf life if you want to store something with fuel in it.
That's like a 20% increase in power! Outstanding! I never in a million years thought that would happen.
I believe the reason for the increase in performance, is due to the high volatility of the 87 octane in the long stroke JD 2 cylinder design. The 87 octane explosion is very fast and combustion is completed before the end of the power stroke is completed. VS the high octane AV gas slower explosion which allows combustion to occur at a point in the power stroke to maximize power output. It is not that the AV gas higher octane is making the power it is the slower explosion. Now if you tried this test in a short stroke large bore engine the results would be the achieve opposite result. Nice test, and that 630 looks and sounds great. ❤
Way to cover all the bases, define octane, say that is the reason for the performance increase then immediately turn around and say it isn't the reason for the performance increase. Especially when a single variable was changed. Unless perhaps you think he might have increased the engines compression as easily as it's fuel ...
I remember a cartoon I read 50+ years ago about a mechanic that didn't like, "all those twitchin' needles drove him nuts"
Nice looking JD
We got 48 hp at pto speed from our 630 back in the day. 1975ish
Nice 630. Sounds really nice. It should really hook up with those tires and weights.
Check out my other video. I have a pulling video
Nice looking tractor! Really like the rear tires. What brand and size are they? Where did you buy them?
@@mauricemelton5755 I bought them at fountain tire they are 600/75r30 alliance
You won’t see any change. If you start adding timing you will. AV gas can take a lot more timing without detonation.
pre-detonation
So you know that to utilize the full potential of av fuel you need to up the compression and advance the timing, right?.
@@timbulthouse7961 I don’t know how to do that
@@jakepeters5814 turn the distributor to advance timing.
Nice tractor! Sounds good too
That is true and he should have adjusted the carb to the Aviation fuel
Sounds like your U joints are 180 degrees off , A PTO should not Rattle like that,that could be why the gauge was jumping all over .
Octane requirements has to do with with compression ratios
Perhaps 'requirements' is correct but an engine is capable of making more power with more spark advance while using av gas. I know this first hand from a slightly better than stock built 283.
My bet is little to no change.
You always run the fuel the Manufacturer says to run. It's very simple!
You do realize that when that tractor was made there was regular leaded gas. It had a little higher octane than the unleaded of today. Not as much as aviation fuel, but the higher octane will make more power because the motor was made to run on a higher octane than the gas of today
It was an experiment. I don’t always run it on av gas
@@shortytari Lead does mean anything different about the fuel performance in combustion. Uneducated people today think if they run 93 octane in a vehicle that clearly says to use 87 regular, that their vehicle will run better with more power. Hahahahahaha
@jakepeters5814 I understand, I've been head Mechanic at a Ford Dealership for 27 years, and we get so man people coming in saying their vehicles are running ruff and knocking, we're talking dozens a month. The first thing I usually ask is what octane fuel are you using. If they say 93, I tell them your Vehicle is designed to run on 87. 9 out of 10 times, it fixes the problem after switching back to 87 regular.
@@jakepeters5814 I understand that. Just pointing out that when it was made the engineers designed it to run on the fuel available at the time, which was a little higher in octane than the fuel of today. Lower octane in an engine that was not designed for it will naturally produce less power than a higher octane fuel. aviation fuel is the extreme. It would take more compression and a little more timing advance to get the most out of that fuel, but it will still make a little more power because it meets the requirement of the motor
Aviation gas the 100octane LL. Low lead for a 60 year old tractor probably not a bad idea but i would not use it undiluted a good mix is 50/50.. do not use alcohol gas.
It needs the all fuel setup to do the test right
You need a foam cover on your microphone we can't hear nor understand you for the wind through your microphone
Well you should have been turning a chrome straight pipe blue
why not give the results J S
I think that it was the same.
It in the description
Get rid of that after market muffler, at least go Deere, it will help alot!!
Prolly could advance timing 2-4 degrees too!
@@glennspreeman1634 that is a deere muffler
Straight pipe helps more
Take off the muffler, straight pipe it
It’s been done and tested them square mufflers make more power than the round style or a strait pipe