khaOs
Part of things
Posts: 115
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Mar 11, 2010 21:49:14 GMT
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I have a few doubts about all of this. i'm doing this conversion on an 1600 engine and the carbs are from a early 90s cbr600. 1st, what size should my jets be? 2nd any pictures on how to connect the vaccum to the new manifold? It's bolted to the stock manifold and i don't understand how you guys are doing it. 3rd i wanted to use the stock mechanical fuel pump. Will it be enough? will it need a fuel pressure regulator?
Thanks in advance!
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kee
Posted a lot
Posts: 4,988
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Mar 11, 2010 21:54:08 GMT
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mech fuel pump should do it without a pressure regulator, providing the engine isnt tuned too much.
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khaOs
Part of things
Posts: 115
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Mar 11, 2010 22:08:47 GMT
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the engine has lightened crankshaft and flywheel only. other than that it's stock!
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Mar 11, 2010 22:24:53 GMT
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If anyone wants manifold drop me a pm, would be quite cheap in steel
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kee
Posted a lot
Posts: 4,988
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Mar 11, 2010 23:32:54 GMT
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normal mechanical fuel pump should be ok then providing it previously fuelled another carb.
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khaOs
Part of things
Posts: 115
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Mar 11, 2010 23:45:43 GMT
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normal mechanical fuel pump should be ok then providing it previously fuelled another carb. it worked just fine with the stock carb? Will it stop when chambers are full like the bike pump would? Thanks! Now what i really need is to find out the size of my jets.
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kee
Posted a lot
Posts: 4,988
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Mar 11, 2010 23:59:53 GMT
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cant say for sure but i know others have used mechanical pumps on kent crossflows with twin 40's without any problems on a standard engine. on a tuned engine they didnt fuel enough though.
what engine is it?
i asked if it fed a carb as it will be a good pressure. if you want to use another pump you could use the same system the bike used that the carbs came from.
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Bike Carbs - How I did it.BenzBoy
@benzboy
Club Retro Rides Member 7
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This is a really useful thread! I am sooo tempted to get six bike carbs for the Bond when funds allow. Bookmarked for future reference.
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kee
Posted a lot
Posts: 4,988
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I'm getting very tempted to get some for my fresh 1.3 instead of putting that curse word weber back on ;D especially as i can get a nice ally manifold from xrtwo.com for a nice price and not have to faff with any wiring been looking on ebay too ;D
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khaOs
Part of things
Posts: 115
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It's an 16SH from an Opel Kadett E. It has a Rochester Varajet II as stock. I've been looking through Mig Web trying to find some info and several people said that the jets need to be drilled to 1,65mm for a 1.6l engine. Now, i have a 1.6mm drill and i know there are 1.7mm drills but how the hell will i drill them to 1.65?
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stevo
Part of things
Posts: 220
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awsome thread, really shows how easy and cheap bike carbing can be
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PhoenixCapri
West Midlands
Posts: 2,683
Club RR Member Number: 91
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Bike Carbs - How I did it.PhoenixCapri
@phoenixescort
Club Retro Rides Member 91
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Mar 12, 2010 11:39:53 GMT
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Great thread - I've already collected most of the parts to convert a Jag XK motor to bike carbs Might help if I get the rest of the car done first thou
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Bike Carbs - How I did it.BenzBoy
@benzboy
Club Retro Rides Member 7
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Mar 12, 2010 13:06:01 GMT
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I have a quick question - I read in this thread that a regular mechanical pump would feed bike carbs sufficiently, so would my standard SU fuel pump be enough to feed 6 bike carbs? It currently supplys twin Strombergs.
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Mar 12, 2010 13:41:46 GMT
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if you look online you can get any size drill, but i would drill it to 1.6, then ream it to 1.65, provide a better finish in the hole
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PhoenixCapri
West Midlands
Posts: 2,683
Club RR Member Number: 91
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Bike Carbs - How I did it.PhoenixCapri
@phoenixescort
Club Retro Rides Member 91
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Mar 12, 2010 13:50:06 GMT
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I have a quick question - I read in this thread that a regular mechanical pump would feed bike carbs sufficiently, so would my standard SU fuel pump be enough to feed 6 bike carbs? It currently supplys twin Strombergs. It might, afterall the engine shouldn't really need much more fuel as it won't be producing that much more power. But then given you can fit a decent electic pump and a regulator for 50 quid you might as well do that - means getting rid of the nasty SU points type pump (I seem to have a habbit of making them stick!)
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Mar 13, 2010 17:12:10 GMT
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Hi-It's useful to try and get the carb's manual-or the bike's manual for diagrams and specifications.Also the float bowl angle need to be the same or nearly at the angle they were fitted to the bike.The needles in the carbs can be adjusted too-some have grooves and circlips,some have washers/spacers.Lifting the needles-raising them out of the jets-helps mid range apparently.I've cbr600 carbs on a 1.4 8v opel but haven't been near a r road yet. Gunson carbalancers and colourtunes are handy for setting up.If there's room,try and keep the bikes airbox for the filters.
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khaOs
Part of things
Posts: 115
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if you look online you can get any size drill, but I would drill it to 1.6, then ream it to 1.65, provide a better finish in the hole I know. But as stupid as it may sound i had to buy them on ebay uk and i'm from Portugal. I didn't find one single place that sold the sizes i need. i really hate this country sometimes. The problem is i bought from a 20 drill set from 0,3 to 1,6mm and i'll probably need 1.7. Grasser how did you tune your cabrs and what is colourtune?
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carmad
Posted a lot
Posts: 2,000
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were would you get a fuel pressure regulator for bike carbs
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its a pity, when i worked for BAe Systems, i used to pilfer virtually every size drill and reamer you could think of. I had no shortage, but that was about 3 years ago, and most are gone now
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carmad
Posted a lot
Posts: 2,000
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Mar 14, 2010 15:25:22 GMT
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take it only cars with distributors that you can put them on with out buying crazy stand alone wiring systems?
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