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Post by smallandfast on Jun 18, 2015 14:27:33 GMT
would like some help with my shopping list please for a big bore/turbo build. im confident on big bore as iv done one before but it'll be my first turbo build on a carb set up.
Big bore-
81mm Busa Pistons and rings Busa rods Rebored cylinders New head bolts New thicker base gasket New 81mm head gasket New case gaskets all round New timing chain
Turbo-
Turbo Exhaust Manifold and gasket Exhaust Intake plenum and gasket
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Post by captain chaos on Jun 18, 2015 16:32:03 GMT
use the stock connecting rods, they are up to the job. And you won't need a thicker base gasket.
And using new/heavy duty head bolts is useless if you don't use new/heavy duty crankcase bolts as well.
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Post by smallandfast on Jun 18, 2015 17:26:26 GMT
use the stock connecting rods, they are up to the job. And you won't need a thicker base gasket. And using new/heavy duty head bolts is useless if you don't use new/heavy duty crankcase bolts as well. These are what I had in mind. On rereading they are actually crank case studs and nuts rather than head bolts. But you get the idea pages.ebay.com/link/?nav=item.view&alt=web&id=271574575492&globalID=EBAY-GB
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Post by katana on Jun 18, 2015 18:04:52 GMT
Well you'll also need to add Barrel studs and HD nuts else the gasket will exit double quick. I personally like copper HG, coated with Gaskacinch and piano wired barrels - good to go. Oh and crankcase breathers - lots, bigger is better
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suban12
Velociraptor
Posts: 49
Reg: Apr 18, 2013 16:03:40 GMT
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Post by suban12 on Jun 19, 2015 1:51:32 GMT
Well you'll also need to add Barrel studs and HD nuts else the gasket will exit double quick. I personally like copper HG, coated with Gaskacinch and piano wired barrels - good to go. Oh and crankcase breathers - lots, bigger is better Katana could you elaborate on what you have for crankcase breathers.Just curious as mine likes to spew some oil into catch bottle after a thrash.Ok during normal ride but think I may need some more breathers in the mix.
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Post by smallandfast on Jun 19, 2015 8:14:20 GMT
Well you'll also need to add Barrel studs and HD nuts else the gasket will exit double quick. I personally like copper HG, coated with Gaskacinch and piano wired barrels - good to go. Oh and crankcase breathers - lots, bigger is better I was planning on copper base gasket then a cometic HG. What's piano wired barrels? Also what would you recommend breather wise?
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Post by katana on Jun 19, 2015 9:25:19 GMT
Simple answer first - Piano wiring is milling a shallow groove into the steel cylinder liner lip - top gasket face, and inserting a thin wire 'ring' so it sits proud of the barrel face. When you use a copper gasket, the steel ring bites into the copper forming a seal and also increases the local clamping force between the copper gasket and the ally cyl. head. Done right they can withstand ANY amount of boost! Engine breathers - lots is always better IMO. My 1186 suck through had the usual dash 8 hose from the oil filler and that went to an open catch can / bottle, There was a dash 10 hose from the centre of the clutch cover and another dash 10 from the cam cover (welded fitting between 3 & 4 plug holes) - both down to a purpose made catch can / vent that also drained back to the crankcase on shut down. The std cam cover vent went to a K&N filter. Never blew a gasket or leaked any oil - burnt plenty via the turbo on over run though!
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jrhartley
Oviraptor
If it don't blow it sucks!
Posts: 18
Bikes: GSXR11, turbo, GSXR11 turbo, Ducati Turbo, GSXR 1000 Turbo
Reg: Dec 13, 2013 11:56:44 GMT
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Post by jrhartley on Jun 19, 2015 17:47:52 GMT
You could use the busa slug's, but dont waste your money on all the other stuff. the people selling the after market parts are just after your money, why replace quality Suzuki parts with junk?. My stock GSXR11 other than busa slugs has been banging out 250/300bhp for years now...... no problems......build the motor with care to Suzuki specs, ( head nut torque spec's, etc!) run a good tune, & it will be fine! Don't believe me? read this... www.rbracing-rsr.com/gsxrturbo.htm
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Post by smallandfast on Jun 19, 2015 19:08:40 GMT
And slugs are?
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Post by smallandfast on Jun 19, 2015 20:27:48 GMT
I still think I'd rather build with upgraded parts rather than relying on stock stuff. Cost isn't a major factor in this build tbh. Obviously don't want to over spend but like most I'm not going to skimp on parts that could fail. Plus The engine is going to have a hard life spending most of its time in the top half of rev range so It needs to be done properly
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Post by katana on Jun 20, 2015 9:44:52 GMT
I'm a little concerned with your understanding - most peeps know slugs are pistons and turbo's are not about top end rev range! I think you need to understand the theory of what you want before rushing headlong into something that may not match your expectations!
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Post by smallandfast on Jun 20, 2015 11:10:44 GMT
I'm a little concerned with your understanding - most peeps know slugs are pistons and turbo's are not about top end rev range! I think you need to understand the theory of what you want before rushing headlong into something that may not match your expectations! Iv never heard Pistons called slugs before lol I'll elaborate on what I meant by that. The engine will be in a single seater track car. So what I meant was its not going to have days/weeks/months at just tootling along at 2-5k on a normal commute or a little blast down some B roads. Every time it will get used it'll be working hard on track. So I'd rather have better quality/upgraded/replacement parts as I'm sure this isn't the application Suzuki had in mind for the stock stuff which is actually only a couple of years younger than me
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Post by katana on Jun 20, 2015 13:27:47 GMT
That explains a bit so in that case i'd seriously look at gearbox and bottom end strengthening as you'll have considerably more mechanical grip from the rear with more mechanical loads from diff and drive shafts into a bike box that is known to be a bit weak with a single sticky bike tyre..... couple that with turbo torque increases on the input side and breakages are likely unfortunately! I'd think about a 3 or 4 speed gear set only = bigger gear teeth = better torque loading potential and gear the final drive lower so you won't have a 70mph first, and potential likely max mph @ about 9 - 9,500 rpm.
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Post by smallandfast on Jun 20, 2015 16:12:36 GMT
What would you suggest for strengthening?
Iv never stripped a gear box down to the extent of changing individual gears so wouldn't really be too confident with that.
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Post by katana on Jun 20, 2015 17:06:49 GMT
Well the heavy duty case studs are a start. As regards the gearbox, as we were using GSX, we used to only use Robinson Industries prepared ones from the U.S. Not sure if they still do them for GSXR's - I guess if you were using GSX you'd be better catered for! The other alternative is using a Busa motor - stronger,lighter and more tuning options available.....the GSXR is getting 'long in the tooth' these days in racing terms!
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