v.f. wrote:I apologize, I mean not everything correctly understood in this article (((But on the other side of premix 100-1 too little for pistons lubricant?
And tell please, what run (an engine resource) will be after porting? It is said that these engines could pass 100000 miles
The harder you run an engine the less life it has. More revs increase wear and fatigue,and parts wear out or break.
Stock 50HP motor running gently - 100,000 miles.
Engine making 120+ hp running at 9500 rpm maybe one race season.
150HP at 10,000 probably 500km.
Suzukidave wrote:No problem .. questions are OK . As for as how many miles you can run one of these engines i know of at least one guy that put over 100,000 miles on a stock engine but that figure will vary on how well it is taken care of and not abused . Нет проблем .. вопросы являются OK. Как и для того, как многие мили вы можете запустить один из этих двигателей я знаю, что по крайней мере один парень, более 100.000 мили на складе двигателя но эта цифра будет варьироваться в зависимости от того, насколько хорошо он не будет принято ухода и не злоупотреблять.
Really those who wrote don't say lies, it is surprising))) 100000 miles to go nuts!!! My jeep passed 115000 and already started to be tired))) And what you can tell concerning oil pumps, pumps 72-73 differ from the pumps 74-76, what pump is better? I bought the spare pump on ebay and it differs quantity of plungers which swing oil. I think that at any porting more productive and reliable pump is better
tz375 wrote:SRIS helps at low speed to move surplus oil form one cylinder to the next one. Block off SRIS to avoid leaks on a performance bike where a little smoke at low speed does not matter.
At higher speed the oil pump pumps more oil.
Modern oil is much better than oil in the 70s. Less smoke, less seizures, more power.
SRIS probably reduces a compression in the cylinder not much, after all when the valve opens and sends oil a compression falls a little? It is the filter screen which I made for the SRIS valves)))
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v.f. wrote:I apologize, I mean not everything correctly understood in this article (((But on the other side of premix 100-1 too little for pistons lubricant?
And tell please, what run (an engine resource) will be after porting? It is said that these engines could pass 100000 miles
The harder you run an engine the less life it has. More revs increase wear and fatigue,and parts wear out or break.
Stock 50HP motor running gently - 100,000 miles.
Engine making 120+ hp running at 9500 rpm maybe one race season.
150HP at 10,000 probably 500km.
Yes, I understood, thanks! But racing 2-takt engine in respect of a resource strange engines, but 150 hp on GT750 on one race?! And what collapses first of all, pistons, connecting rods, bearings? It is a MOTO GP engine resource, and there engines were 220 +, certainly both materials and a design, but racing days off (training and race) they after all maintained others?
The GT engine engine has a pretty long stroke ( 64mm ~ 2.52in ) so piston speed become a issue if run at rpm's higher than around 8500 for long periods of time like in racing . The skirts on the stock cast pistons are a weak spot so putting in a after market set of forged pistons would help . Then comes the stock pressed together crank but that can be helped with a fresh assembled trued and balanced crank being pinned or welded to prevent twisting .
Yes, I understand that these engines were never designed specially for races and 40 years ago there were absolutely other speeds, but it is all the same interesting))) Pistons and connecting rods can be changed and what to do with bearings? I heard, what only original Suzuki bearings are suitable for restoration of crank of a shaft?
GP engines it is other Universe, to go by it not probably and very expensively, but all the same I would like to have it at home, simply for appearance)))http://phildystunt.free.fr/?cat=89
It is necessary to go to sleep, at my child the hockey season began, early in the morning on training we will go.
the quantity of questions exceeded an admissible limit?))) Hello! Continuation of questions about porting.А that if transfer port to make here such? theoretically only it should be better
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Thanks! I mean I will leave a cross-section of ports as is. I won't do boost port at me there is no such possibility, I will expand transfer ports as you advised to me. + 3мм top, the-3rd down and 40мм at length.
tz375 wrote:
Ja-moo
Raising stock exhaust roof too much breaks into the water jacket. That's why we all use a spacer and it also raised transfers by the same amount to keep stock blowdown timing.
That's what I thought. 2.5 mm is not a lot, so so I see where you have to use the spacers.
tz375 wrote:SKi Doo/Sea Doo reed boxes and Vforce reeds = good
You need to build reed boxes and machine the cylinder block to fit them. With reed valves, add a boost port to extend one transfer port up at 55 degrees.
With 3mm spacer, lower the ports by 3mm on the lower face. Lower the intakes ONLY if you fit reeds. No reeds leave intake floor.
I am going to do, as we discussed here. Only to increase transfer port at length to 40мм instead of boost ports
tz375 wrote:
Ja-moo
Raising stock exhaust roof too much breaks into the water jacket. That's why we all use a spacer and it also raised transfers by the same amount to keep stock blowdown timing.
That's what I thought. 2.5 mm is not a lot, so so I see where you have to use the spacers.
The confusion is because the port dimensions in that drawing are from the spacer only.
Spacer plus extra gasket raises the barrel 3.0mm so we machine 3mm off the top surface (40-3)
You can also raise the exhaust slightly for a little more power at higher speed (40-3-2.5).
Use a spacer
Machine 3mm off the top of the cylinder block
Make the exhaust slightly wider
Make the transfers wider
Lower the floor (bottom) of the exhaust port and transfer ports
Clean up the intake port - remove any big steps
I understood, you corrected my drawing porting taking into account base gasket 3мм and cutting of top of block cylinder on 3мм. But just in case I will draw once again)))
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