Benno Posted October 9, 2013 Share Posted October 9, 2013 Bolt it up to that spare head, tighten bolts up and heat it, should be able to get rid of the worst of the bend like that I would imagine. Yeah, a bit of bowing is to be expected with laser cutting, especially with a part that large. There is nothing to support the part vertically from flexing, and a large amount of heat is added in the cutting process. Wasn't an issue last time due to the size of the flanges. Quote Link to comment Share on other sites More sharing options...
Rookie Posted October 9, 2013 Share Posted October 9, 2013 It will have heated it and heat causes it to bend so yea you would expect it to have warped lightly, you could weld it with the curve facing inwards, and the heat from the weld will pull it straight. Quote Link to comment Share on other sites More sharing options...
Benno Posted October 9, 2013 Share Posted October 9, 2013 For anyone else interested in it, this is what the new flange looks like (or close to with a few minor changes). Exhaust manifold will bolt directly onto this (end and center ports) with the runners welded directly to this. Quote Link to comment Share on other sites More sharing options...
Steelies Posted October 9, 2013 Share Posted October 9, 2013 lowl, autobend bent your stuff. yeah whack it in a vise. could even be from stresses in the plate itself? no biggie though. it may bend again when you weld stuff to it, so jig the shit out of it etc Quote Link to comment Share on other sites More sharing options...
peteretep Posted October 9, 2013 Share Posted October 9, 2013 It will likely be from the thin sections between the ports getting too much heat in them and not being able to absorb it, and the material is quite thick so needs alot of heat input Quote Link to comment Share on other sites More sharing options...
BlownCorona Posted October 9, 2013 Author Share Posted October 9, 2013 all good, doesn't sound like the end of the world. we have a small press at work, might give that a hoon Quote Link to comment Share on other sites More sharing options...
BlownCorona Posted October 10, 2013 Author Share Posted October 10, 2013 Few minutes with a press has it sorted more that suitable. Quote Link to comment Share on other sites More sharing options...
mutiny Posted October 10, 2013 Share Posted October 10, 2013 if you need use of my machinery ill be in chch for the weekend end of month/youll porbably want it done by then Quote Link to comment Share on other sites More sharing options...
BlownCorona Posted October 10, 2013 Author Share Posted October 10, 2013 I'm very much hoping to have it sorted by then but if not will certainly keep that in mind! The drop saw made everything so easy so if anyone else local has something similar and doesn't mind me visiting for a few minutes that would be awesome! Quote Link to comment Share on other sites More sharing options...
Mitch.W Posted March 15, 2014 Share Posted March 15, 2014 sooo was looking at putting bike carbs on my car (Honda civic with a D15b) so 1500cc sohc. Just wondering if they would be to small, they are off a cbr250rr and 30mm, Would these be too small? they should work if i drill the jets out? Quote Link to comment Share on other sites More sharing options...
peteretep Posted March 15, 2014 Share Posted March 15, 2014 what size is the existing port/s on the engine? Quote Link to comment Share on other sites More sharing options...
BlownCorona Posted March 16, 2014 Author Share Posted March 16, 2014 Super basic rule of thumb I used was multiply the cc of the engine with the red line rpm of both engines and compare the number, this should give you an idea of if they will flow enough to support the engine at max rpm, from there you can look at jet and port sizes etc... My inclination is that the 250cc carbs are going to be too small for an engine 6x larger, I used 1100cc bike carbs on a 2000cc engine Quote Link to comment Share on other sites More sharing options...
Mitch.W Posted March 16, 2014 Share Posted March 16, 2014 what size is the existing port/s on the engine? the intake port is about 40mm at its largest. Super basic rule of thumb I used was multiply the cc of the engine with the red line rpm of both engines and compare the number, this should give you an idea of if they will flow enough to support the engine at max rpm, from there you can look at jet and port sizes etc... My inclination is that the 250cc carbs are going to be too small for an engine 6x larger, I used 1100cc bike carbs on a 2000cc engine yeah they probably aren't the best but they are super cheap so thought there may be a way of making them work. http://www.trademe.co.nz/Browse/Listing.aspx?id=706804668 Quote Link to comment Share on other sites More sharing options...
BlownCorona Posted March 16, 2014 Author Share Posted March 16, 2014 For what it's worth, I only paid about 100 bucks for my mikuni 40mm flat slide gsxr1100r carbs. So don't let the price tempt you, I really think they will starve the engine about 4000 rpm Quote Link to comment Share on other sites More sharing options...
Beaver Posted March 16, 2014 Share Posted March 16, 2014 yeh you can pick up beter sized carbs for 100 odd mitch, would be worth waiting Quote Link to comment Share on other sites More sharing options...
Mitch.W Posted March 16, 2014 Share Posted March 16, 2014 sweeeet, this thing is going to be revving out to about 9k hopefully so i may need something quite big. No doubt i will be posting more in this thread once i start to install the carbs and go through what you guys have and try make them run right hahah. Quote Link to comment Share on other sites More sharing options...
Brock-Lee Posted March 16, 2014 Share Posted March 16, 2014 9k lol. Get a k20 Quote Link to comment Share on other sites More sharing options...
Mitch.W Posted March 16, 2014 Share Posted March 16, 2014 considering it revs out to 7.5-8k as it is its possible. Bisimoto loves these motors so much aftermarket parts for them. nah nah nah, if i had a k20 it would be going in my rx7... student budget spec. Quote Link to comment Share on other sites More sharing options...
Steelies Posted March 16, 2014 Share Posted March 16, 2014 For what it's worth, I only paid about 100 bucks for my mikuni 40mm flat slide gsxr1100r carbs. So don't let the price tempt you, I really think they will starve the engine about 4000 rpm dayum, let us know next time you spy a set of flat slides for $100, wicked deal! 1 Quote Link to comment Share on other sites More sharing options...
peteretep Posted March 16, 2014 Share Posted March 16, 2014 another way to basically compare carbs would be to look at how much power the bike made vs what you are expecting. R1's for example made around 150hp at the flywheel so is OK for up to around 2 litres generally Quote Link to comment Share on other sites More sharing options...
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