Samikoo

That one looks great for my purposes, thank you. And they're quite cheap too, just like me.

You don't happen to have the length of that swingarm scribbled somewhere?

Thanks. Anyone ever fitted one of these on a GR72A? I think I'll see what ZX12 and the other big bikes are using.

Might be, but the chain would still hit the frame. And I want a wide rear end...

Yes, this is the part that I understood, that is why I posted a picture of my butchered frame. I'll run the chain outside the frame if that's what it takes, I just need to find a swingarm that can take a 6" wheel... It currently has a 4.5" wheel, and it's real tight with the chain to frame clearance, so I kinda figured that one out on my own.

Yes, I know. That's why I only asked about the swingarm.

I've seen a few different swingers fitted to these things, so I was wondering what would be my options if I wanted to fit a 6" wheel? It would be a big plus if the swinger in question would be as short as possible.

What do you mean by negative feed? The black wire? It is there to ground the unit properly, and without it the unit will find ground somewhere else. That's what causes most electrical problems, poor grounding. The reason yours is cutting your revs is beyond me. Do you have a picture of the system installed on your bike?

Yes, but if there is the possibility of using 20-40C water to cool it, why not. Air-to-air with 20C ambient temperature might drop the charge air from 167C to 67C, calculated with a 70 percent efficiency. That's not taking heat soak into consideration. Not that you could fit an air-to-air cooler that big on bike, but still. But hey, people are free to do as they please, and using engine coolant would be better than nothing with those manly boost figures. I also think one should always try to use charge cooling to fight off detonation and to keep things cooler inside the engine. Like for a 15psi (1bar) 1200cc engine the addition of a 70% efficient charge cooler with a 0.5psi pressure drop would yield 40 additional horses, and the temperature of the air going in to the engine would be 65C cooler than without one. But, as we are dealing with motorcycles, space is very limited, and a cooler that's able to flow that amount of air is not small. And also the time spent with the driver holding full throttle won't be that long either... So, you kinda need one, but you really don't.

Yes, and I don't think anyone is actually using engine coolant to "cool" charged air... I mean, coolant runs usually 90 degrees celcius, so what good would a heat exchanger do if the cooling media was that hot? All the cars(and other vehicles) I've seen that had water-to-air gharge cooling had a separate coolant system for the charge cooling, including pump, lines, charge cooler and another heat exhanger(to cool the coolant). Making all that fit to a bike would be a bit of a challenge, to say the least.

http://www.woessner-kolben.de/en/products/motorcycle/ That's the only one I found, so far. And they don't have a huge amount of possibilities, especially when it comes to small (<- 70mm) pistons.

GR72A (GSX750ES), and aiming for 9-10:1. So stock size is 67mm. If I can find pistons with a diameter of 67-69mm, I can bore the existing cylinders. If not, there is the option of fitting bigger liners and going for 70-72mm in diameter. CBR600F 1990-98 has a 17mm pin, and those can be had in 67mm size. 2003-06 has a 16mm pin, and 2007-16 a 15mm one. No idea on compression height. ZX6R has both 15 and 16mm pins, and those too are offered in 67mm, the same goes for GSXR600 2001-03 with a 14mm pin, and 2008-12 with a 15mm pin. As long as the pistons would be a close match, that would help. Milling the piston tops or shaving a bit from the block is doable, boosting the engine with original pistons beyond the pressure generated by the average fart is not... I'm putting the engine back together with stock internals, but I know I will be tempted to turn up the boost so I'm trying to find stronger pistons and a spare block to match.

Hi there! I'm trying to find some suitable (preferably forged) pistons for my turbo project, but I've had no luck finding information on compression heights for the pistons that match my criteria. Has anyone come across a catalog or a web page where they would give actual dimensions of the pistons, not just the diameter? My pistons would be between 67-72mm in diameter with maybe an 18mm pin (or smaller, I can always sleeve my con rods), but it would be really nice to know the compression height before ordering a set.

Any updates?

There used to be a chart on the old original forum with fork lengths and such, Don´t know if there is one to be found right now. I have one printed somewhere, I´ll see I´ll find it and if I do, I´ll scan it. You go to that google thing, and type "suzuki offset front sprocket". And bang, pictures of such things should appear. I made my own out of two original sprockets, but there are commercial offerings available.

Is there any specific reason to change the swingarm? If not, you can fit a GSXR wheel with a 160 tire on it to your existing swinger. Mine has a 170, but it´s too wide for the wheel. Older GSXR´s had these funny rear wheels. You may need to swap wheel bearings too, can´t remember. And modify your wheel spacers and rear brake caliper hanger. You´ll also need an offset front sprocket. I´m affraid there is no real bolt-on option for these bikes, but all the above can be done without welding. For front ends you need to find a chart with streering stem bearing dimensions. That gets you a long way. I´m sure someone has done a front end swap with these, mine is still in progress and it´s a mix´n´match affair so I can´t help much.

Yes, that seems like a better option. I´ll propably order it when I get the engine ready.

So I shouldn´t bother with it? We have 98 RON around here.

So, what method are you using (if any) to retard the ignition under boost? Dyna 2000 and a pressure switch? Less static advance and live with it? Something else? Nothing? I´d also like to know what kind of boost numbers you are running with your setup. My plan is to run 0.5bar of boost. And please, no EFI/ECU jokes here. I know it´s the easier way...

Thanks! Yes, I understand it´s not sophisticated. It just seems like the best bang for buck for a low budget, low boost build.

I did a search and couldn´t find the answer to my question: Which Dyna 2000 system should I get for my GR72A aka GSX 750 ES? DDK3-2? I wan´t the possibility to run a retard curve via a pressure switch (and maybe the option of programming my own advance curve), and it seems like it can be done with the 2000. So, can I fit the kit made for the GS 1150 tec.? Is the crank trigger similar? Or is there any other (cheaper) way of doing this?