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Post by danm54 on Sept 7, 2013 17:48:46 GMT
Right, starting the homework on my engine build, GSXR 1100W draw through EFI as you may know. I'm after a bit of info on the best route to take and which parts are best.
Going to build a completely fresh motor, all new bearing etc. Thinking 77mm turbo pistons, MTC seem to be all I can find that do low comp pistons in 77mm. Do JE not do low comp ones?
The bigger questions come with the head. New valves seem to be a must so is it worth going 1mm oversized? Looking at Ferrea Competition Valves, they do standard size or 1mm over.
Next is valve springs, KPMI do a lightweight spring kit with a description of ''0.430 Valve Lift OK 50# Seat Pressure / 155 lb. at .430 lift'' Whats that mean in English and will standard cams and cam caps be ok with that much spring pressure? A good set of standard cams will be ok I believe.
Then there's the option of new valve guides as well, if I'm going with new valves is it worth doing the guides while I'm at it?
Finally, porting the head. Worth opening the exhaust ports up a bit? Any real benefits on a turbo motor? Same with the intakes.
Now just what I've seem comes in at a pretty penny or 2 so this won't be a super quick build, but I do hope it'll be done for next summer. The extra cost of things like valve guides and porting doesn't worry me too much as it'll just mean it takes longer and if that's the best way to go I can wait.
Cheers Dan
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Teresa O.
Velociraptor
Posts: 37
Bikes: Trickframed 1127, Turbo 14 and many more
Reg: May 31, 2013 18:51:42 GMT
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Post by Teresa O. on Sept 8, 2013 12:02:12 GMT
street or track?
I guess "nitro" on here has the most experience on a 270+ horsepower W-engine on the road with lots of daily trashing on the autobahn aso...
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Post by danm54 on Sept 8, 2013 12:58:48 GMT
Street bike but will see a track or 2 I'm sure.
Will take a look through Nitro's build log actually, never thought of that!
Ah, his full thread is on the old forum!
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Post by captain chaos on Sept 8, 2013 16:09:11 GMT
and the old forum is still down, otherwise i could have rescued some of it
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Post by danm54 on Sept 8, 2013 20:50:14 GMT
I'm sure Nitro will be along soon with some helpful info.
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Post by maggotbreath on Sept 9, 2013 2:03:40 GMT
I'm using MTC pistons in my oilboiler, good stuff and very good customer service. I exchanged quite a few emails with there tech before purchase, responses from them were very timely.
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Post by danm54 on Sept 9, 2013 18:52:26 GMT
I'm using MTC pistons in my oilboiler, good stuff and very good customer service. I exchanged quite a few emails with there tech before purchase, responses from them were very timely. That's good to hear, heard of their lock-ups but not their pistons. They're not too badly priced but I imagine shipping and import tax will soon add to the price!
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cam
Oviraptor
Posts: 8
Reg: Jun 15, 2013 20:18:57 GMT
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Post by cam on Sept 9, 2013 19:49:58 GMT
Speak to roger Upperton see what he comes up with his prices are usually good
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Post by danm54 on Sept 9, 2013 19:52:18 GMT
Speak to roger Upperton see what he comes up with his prices are usually good Meant to call him today actually but never had time. Will make time tomorrow though, see what his views are and what magic he can work!
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Post by pasis on Sept 9, 2013 21:08:49 GMT
I think it is necessary to put the pistons MTC and valves kpmi. and a spacer under the cylinder block. To CR was about 8.5. The rest you can leave standard
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Post by danm54 on Sept 9, 2013 21:53:34 GMT
The pistons take the comp ratio to 9.8:1, thought that was low enough? Don't want it to be too flat off boost.
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Post by danm54 on Sept 10, 2013 10:48:04 GMT
Just spoke to Mr Upperton and yea, I got carried away! New valves obviously but standard size is fine, new stock springs rather than HD ones and the rest is good.
Saved me a few quid!
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Post by nitro on Sept 11, 2013 14:11:44 GMT
The 1074 engine tends to give a lot of horsepower, but less bottom end power. My first turbo engine has 77mm 8:1 JE pistons, carrillos, 1mm bigger APE stainless valves, orient Express valve springs, camellia cam chain, OEM cams, portet head (ports also a bit bigger), balanced crank, new bearing shells with more clearance, slash cutted gearbox, Lock up clutch with oem discs. Never had it on the dyno with full boost, but the original engine with portet head an less comp. already gave 238rwh @ 0.6 bar boost!
Also with small turbos this engine is not the best for street app. Last winter I swapped the GSXR1000 TBs to GSXR600 ones with longer smaller manifolds and build a new engine (which I never tried jet). The new engine just has 76mm 8,5:1 JE pistons, carrillos, slightly ported head, slash cutted gearbox, lock up, balanced crank and cams of Austria modell (milder). Valves and springs are original. I hope this will give more bottom end power and the smaller pistons are more reliable. Some people (also Roger Upperton) told me that it´s better not to bore these engines to much.
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Post by danm54 on Sept 11, 2013 14:33:57 GMT
Where did you get your pistons from Nitro? Couldn't find 76/77mm turbo ones when I looked. Roger also told me about the 77mm bore possibly being an issue so 76mm is a good size.
Is the comp ratio ok off boost? I'm sure 9.5:1 has been recommended before but I may be wrong. I have a T3/4 turbo so don't want to have to keep it spooled up all the time to go anywhere. Although the fuel injection should help out.
I'm going to price up new standard valve springs and see how they compare to HD ones. I'll be getting the crank, rods and pistons balanced but was going to stay with standard shells, just new ones.
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Post by nitro on Sept 11, 2013 17:37:22 GMT
I friend of mine imports the parts from USA for me. I told him, how I want have my pistons and they made. The less CR, the higher boost you can drive. I also don´t know, if you can get good fuel in your country. I have nearly allways 100-102 octane. The W engine is a dead engine at low rpm. There was no noticeable difference offboost with 8:1 or 11,5:1 for me. May be you can try 9:1 with 1 bar of boost with good gas. The W engine also has problems with exhaust backpressure, so small turbines/exhaust housings is a no go. I hope the milder cams of austria modell can solves this. You should make sure that the new shells have min clearance of 0.04mm.
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