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Post by timmytimmz on Oct 9, 2012 18:59:42 GMT 10
just curious guys, has anyone ever tried putting in a vt750c engine in a vt400? i was told its the same frame so it should be all good to do but I'd want to get your input on this. what do you guys say?
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Post by Deleted on Oct 9, 2012 19:07:56 GMT 10
just curious guys, has anyone ever tried putting in a vt750c engine in a vt400? i was told its the same frame so it should be all good to do but I'd want to get your input on this. what do you guys say? Only talking to a bike salesperson last week and he said the engine is the same just sleeved to cut back the power . Have heard this before so must be somewhere near right. No reason you couldnt swap them out seeing the frame is the same . The weight is heavier in the 400 by about 10 kg,s He said that is due to the bore,s being sleeved . Simon may be able to input on this iff he is around . Or anyone else for that matter . Just what i was told by a former Honda salesperson , Cheers Ray
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Post by Richo on Oct 9, 2012 19:13:17 GMT 10
Would be easy enough. New blocks and heads, new pistons and con rods. Should be about it. Obviously a remap of the injector as well.
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Post by deankeogh17 on Aug 24, 2013 2:10:44 GMT 10
Would be easy enough. New blocks and heads, new pistons and con rods. Should be about it. Obviously a remap of the injector as well. Wondering if anyone has done this
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Post by Deleted on Aug 25, 2013 9:10:55 GMT 10
Would be easy enough. New blocks and heads, new pistons and con rods. Should be about it. Obviously a remap of the injector as well. Wondering if anyone has done this Not that I, m aware mate. Basically the whole 750 engine should go in I suppose. Be great to have a bit more power hey. As Richo said only change the head parts and bingo. If you know of a 750 block in good nick, go for it. Make sure you document and take pics. We can store them in the Classroom section then.
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Post by zombielovechild on Sept 18, 2013 9:20:43 GMT 10
just curious guys, has anyone ever tried putting in a vt750c engine in a vt400? i was told its the same frame so it should be all good to do but I'd want to get your input on this. what do you guys say? Only talking to a bike salesperson last week and he said the engine is the same just sleeved to cut back the power . Have heard this before so must be somewhere near right. No reason you couldnt swap them out seeing the frame is the same . The weight is heavier in the 400 by about 10 kg,s He said that is due to the bore,s being sleeved . Simon may be able to input on this iff he is around . Or anyone else for that matter . Just what i was told by a former Honda salesperson , Cheers Ray I've actually researched this and the bore's are sleeved to restrict it to 400 bit is the same engine , an alternative to a whole engine change is getting the engine bore'd out to a 750 which may be a cheaper option and it has been done ill see if I can find the link however you will have to get it decommissioned as a lams model
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Post by Deano on Sept 25, 2013 17:57:06 GMT 10
I would like this to be an easy mod but the 750 engines bore & stroke is 79mm x 76mm and the 400 engines is 64mm x 62mm doesn't this mean the crank would be different?
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Post by Richo on Sept 27, 2013 5:27:50 GMT 10
To shorten the stroke all Honda would have to do is lengthen the connecting rod.
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Post by Deano on Sept 27, 2013 9:10:50 GMT 10
I don't understand how that would change the stroke? as i understand it that would have the piston higher in the bore at the bottom of the stroke but hit the head at the top...but I'm willing to be schooled
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Post by Azza ( AB ) on Sept 27, 2013 15:54:59 GMT 10
Hey Deano, in keeping the 400s crank and fitting 750 top end the motor would be horribly under square or is that over square I can never remember. Anyhow without doing the sums lets say we end up with 600 cc but due to the out of squaring of the stroke to piston would this adversely effect the torque or the balance of the motor. Me thinks it would be cheaper and easier to just buy a 750. Cheers Azza
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Post by Richo on Sept 27, 2013 16:06:06 GMT 10
Www.carcraft.com/tech articles/ccrp_ 9812_engine_boring_and_stroking_fundementals/view all.html Should explain better than I can how stroke can be changed.
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Post by Deano on Sept 27, 2013 23:56:46 GMT 10
Hey Deano, in keeping the 400s crank and fitting 750 top end the motor would be horribly under square or is that over square I can never remember. Anyhow without doing the sums lets say we end up with 600 cc but due to the out of squaring of the stroke to piston would this adversely effect the torque or the balance of the motor. Me thinks it would be cheaper and easier to just buy a 750. Cheers Azza Thanks Azza! This was my thought too. I think over square is right. To get the 750cc the crank would need to be changed out as well. Although I don't know about "adversely" affecting the torque or balance. If the parts put in the engine are balanced it should spin nicely and the bigger bore would mean more power. The torque value shouldn't go down and there'd be more power up top . I was too hung up on 750cc to think about this. I'm thinking the only reason why this won't work is the valve sizes in the heads, the bigger valves might not work, but there're engines out there a lot more over square than this would be. I'll let ya know what I find out.
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Post by Deleted on Sept 28, 2013 8:12:11 GMT 10
Hey Deano, in keeping the 400s crank and fitting 750 top end the motor would be horribly under square or is that over square I can never remember. Anyhow without doing the sums lets say we end up with 600 cc but due to the out of squaring of the stroke to piston would this adversely effect the torque or the balance of the motor. Me thinks it would be cheaper and easier to just buy a 750. Cheers Azza Thanks Azza! This was my thought too. I think over square is right. To get the 750cc the crank would need to be changed out as well. Although I don't know about "adversely" affecting the torque or balance. If the parts put in the engine are balanced it should spin nicely and the bigger bore would mean more power. The torque value shouldn't go down and there'd be more power up top . I was too hung up on 750cc to think about this. I'm thinking the only reason why this won't work is the valve sizes in the heads, the bigger valves might not work, but there're engines out there a lot more over square than this would be. I'll let ya know what I find out. If you really want to change to a 750 buy a 2nd motor from the wreckers swap the lot, going to be cheaper and you can always swap back if you want to sell your bike.
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Post by Deano on Sept 28, 2013 11:21:00 GMT 10
Thanks Azza! This was my thought too. I think over square is right. To get the 750cc the crank would need to be changed out as well. Although I don't know about "adversely" affecting the torque or balance. If the parts put in the engine are balanced it should spin nicely and the bigger bore would mean more power. The torque value shouldn't go down and there'd be more power up top . I was too hung up on 750cc to think about this. I'm thinking the only reason why this won't work is the valve sizes in the heads, the bigger valves might not work, but there're engines out there a lot more over square than this would be. I'll let ya know what I find out. If you really want to change to a 750 buy a 2nd motor from the wreckers swap the lot, going to be cheaper and you can always swap back if you want to sell your bike. That would be too easy It's not that I want a 750 & the cost isn't really an issue I just love this bike and want to customise it and changing the look was never going to be enough. I have a mate who builds his own drag engines and I'm sure he can help me to modify the 750 heads and cams to suit the 608cc. I will do some homework.
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Post by zombielovechild on Sept 28, 2013 21:49:41 GMT 10
Where are you in Australia Deano , I want to upgrade my bike as well and know a lot about it but have no one to help me do it (especially in the sly)
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