650 rpm vs 1000 rpm

[Craig]

Craig,
I read that as the bore. Stroke is 5.5 inches on all models.

You are correct sir.  My bad.

[albany dbd]

If I were to do it over i would go with 2 10-1's coupled together 360 deg. out from one another running at 700-750 or so. Wouldnt be to tough to come up with a industrial coulpling that would handle the torque. That would give you huge rotating mass. even power strokes 14-15 hrs maybe more. not to mention something new to talk about on here again.  Derik

[allczns]

Derik,
I like it.
What about coupling two twins together? 

[oliver90owner]

allczns,

WOT!!

40 or 50 HP at that speed through a 2" crank!  An Indian crank at that!  The coupling could be sourced but I would have some doubts about the engine(s) surviving too long. 

My  50HP (nearly) tractors (kero burners) have crank journals of 3" diameter and develop max power at 1125 rpm.

Regards, RAB

[Eco Diesel]

Hi fellows!
If you have ever held one of these 114.3 mm or 130mm cast iron pistons in your hand you will understand why you probably would not want to run engines with them at 1000 rpm. They are very heavy! If you want to run the engine at 1000 rpm pick aluminum pistons. I would not really be concerned about running the cast iron pistons up to 850 rpm though. If you plan on running one of these engines at 850 rpm or 1000 rpm I would suggest getting the higher speed solid w/holes type instead of spoked. My feelings are that they are safer and appear to be nicer made. The Gtc engines engines all use counter balanced cranks. The 6/1s have 114.3 mm pistons and use a injector pump with .032 marked on the pump. The 8/1 is a sped up 6/1 to 850rpm but I have not brought one in yet so I havn't seen if the injector pump is different from the 6/1. The 16/2 is a 12/2 that is sped up to 850 rpm. The 10/1 engine uses a 120mm piston just like the 20/2 that Jens has but as I have only brought in 1 of the 20/2 engines and never got to see it uncrated as it went out the door to an anxiuos customer, I don't know if the injector pump is calibrated differently. Out of curiosity Jens, what is the number on your injector pump? The GTC 12/1 uses a 130mm piston just as the 24/2 engine does and the injector pumps for both these engines are marked .034  The 12/1 engines come with 23.400" diameter solid type flywheels with 5 holes while the 24/2 and 20/2 engines usually come with 20.275" diameter flywheels unless you specify different. I am not sure why they don't put the larger diameter flywheels on the big twins. Some of the members on the forum have Youtube videos of their engines running at or around 300 rpm and they sound just beautiful. Slower and heavier is better in my opinion.

Troy

Troy

[JohnF13]

The 10/1 and 20/2 should have a 034 pump, while 032 MAY be adequate, it is a bit too small.

[emerald]

There was talk of what engines used certain part number pumps, it may be here some place or a search via google might get it.

From memory I think the engines about 8HP and 16HP twin used a different pump.