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Post  coxaddict on Wed Sep 23, 2020 5:21 pm

On the subject of .049 versus .051 power difference my mechanic friends used to race Cox dragsters on lines every Sunday in the parking lot of a shopping mall back in the eighties.  They used to swap .051 pistons and cylinders for the .049 ones and blew away all the competitors including some 1/8th scale on road R/C cars with $250 dollar motors.  The dragsters would be started and allowed to rev with their tires just off the ground, then let go when the green light was given.   These guys were serious with their side bets and money invested.  They would let me in on their secrets because they knew I wasn't going to ever compete with them.  I talked to one of them lately and he still has his cars. Hmm, now that I prefer cars to planes I wonder if he would sell them to me? Eyebrows


Last edited by coxaddict on Wed Sep 23, 2020 5:25 pm; edited 1 time in total (Reason for editing : spelling)
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Post  706jim on Thu Sep 24, 2020 11:56 pm

My experience with the Cox dragsters was a bit less formal. I raced a Cox funny car in the basement of our local university. Biggest problem was getting both engines running at the same time. FWIW the funny car seemed to beat the dragster off the line but the dragster ended up winning at the top end. How cool is that!
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Post  Ken Cook on Fri Sep 25, 2020 4:01 pm

Most of the dragsters I owned were all single bypass cylinders. It's no wonder adding a .051 made it fast. The problem with these cars were the drive train. The Eliminator used a hex shaft and the wheels were hubs with rubber tires on them. The hub had a female hex to accept the shaft. The hex would split on the molder corners all the time and the shaft would no longer turn the wheel. The later Stinger had no hubs with the wheel and hub as a unit and entirely made of plastic these were real junk. They would break looking at them and usually when you started it. Adding a TD .051 to one of these would certainly break it a lot faster.
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Post  coxaddict on Fri Sep 25, 2020 4:39 pm

I don't how they kept their cars together, but one of the guys stuck a TD in one of his. He said he had re-geared the car to take advantage of the higher RPMs. I guess they found ways to make parts from other types of cars fit.
Single bypass versus the .051 cylinder/piston power difference
in this application would be moot.
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Post  davidll1984 on Fri Sep 25, 2020 8:08 pm

From m'y expérience wit cars single bypas cylinder is giving tork lower rpm lower top and rpm Good for chort axel rc cars help for heavy cars m'y gtp wit maple egr valve is faster on straight lign tee dee wit tuned pipe is a other story very powerful engine To mutch for the jerobee frame now in 1\10 scale camaro called the RJ bee tee dee powered rc cars wil run wit m'y espo f1 for comparaison of two 1\10 cox powered rc cars tink kyosho f1 as no chance To win lol! Eyebrows
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