Go Back   Team-BHP > BHP India > Motorbikes


Reply
 
Thread Tools Search this Thread
Old 19th September 2011, 02:47   #1
BHPian
 
abhishek24x's Avatar
 
Join Date: Jan 2010
Location: PB08/PB10/HR26
Posts: 55
Thanked: 29 Times
Default Bike Engine Swap Advice

I own a 2005 model TVS Star City & its lying unused since 2-3 years. I'm now thinking of experimenting & swapping its 100cc engine with a Honda Unicorn's 150cc engine from the ATV I had made at my engg. colg as a project using a unicorn's engine & chassis. Since both bikes use engine as a stressed member & i think the swapping would be easy..is it possible??? Any ideas???
abhishek24x is offline   Reply With Quote
Old 19th September 2011, 13:18   #2
Senior - BHPian
 
Join Date: Apr 2008
Location: Bangalore
Posts: 2,295
Thanked: 646 Times
Default Re: Bike Engine Swap Advice

I guess it should be possible if you consider all factors like handling, weight distribution etc.

The stock unicorn is around 140kgs IIRC and the Star City should not be more than a 115kgs. So you have to consider the weights of the engine and the way you will distribute the extra weight.

You also have to consider if the chassis can handle the extra power the engine makes since the Star City makes about 7-8Bhp while the Unicorn makes 13Bhp. So its almost double the power at crank.

All the best and do let us know if you go ahead with the swap!!
abhinav.s is offline   Reply With Quote
Old 19th September 2011, 20:56   #3
Senior - BHPian
 
ku69rd's Avatar
 
Join Date: Sep 2009
Location: Bangalore
Posts: 2,249
Thanked: 1,181 Times
Default Re: Bike Engine Swap Advice

Quote:
Originally Posted by abhishek24x View Post
.is it possible??? Any ideas???
Mate,
What you gonna gain of it? understand if you are trying to build it to a purpose, here don't think it's gonna do a world of good. Can be done, but you might have to reinforce the chassis along the main tubes so that they get to handle the increased weight/speed/changed dynamics.
ku69rd is offline   Reply With Quote
Old 19th September 2011, 22:56   #4
Distinguished - BHPian
 
Join Date: Jul 2009
Location: Kolkata
Posts: 3,284
Thanked: 1,651 Times
Default Re: Bike Engine Swap Advice

Quote:
Originally Posted by abhishek24x View Post
Since both bikes use engine as a stressed member & i think the swapping would be easy.
I would think it would be the other way around. Plonking an engine on a bed is easier than integrating it into a foreign chassis.

Regards
Sutripta
Sutripta is offline   (1) Thanks Reply With Quote
Old 20th September 2011, 09:55   #5
Senior - BHPian
 
SunnyBoi's Avatar
 
Join Date: Dec 2006
Location: Mysore / B'lore
Posts: 1,331
Thanked: 1,527 Times
Default Re: Bike Engine Swap Advice

Illegal. 'nuff said.
SunnyBoi is offline   Reply With Quote
Old 20th September 2011, 16:17   #6
BHPian
 
Rennjit's Avatar
 
Join Date: Feb 2009
Location: Coc, Cbe
Posts: 588
Thanked: 73 Times
Talking Re: Bike Engine Swap Advice

Quote:
Originally Posted by abhishek24x
... swapping its 100cc engine with a Honda Unicorn's 150cc engine
Yawn ..
Quote:
... from the ATV I had made at my engg. colg as a project using a unicorn's engine & chassis. ...
Cool., can we have some details/ pics?
Rennjit is offline   Reply With Quote
Old 20th September 2011, 20:04   #7
Senior - BHPian
 
KarthikK's Avatar
 
Join Date: Nov 2009
Location: Bangalore
Posts: 1,913
Thanked: 3,473 Times
Default Re: Bike Engine Swap Advice

the RC book would then contain an invalid/obsolete engine number after the swap; and what happens when the bike is sent for insurance renewal inspection? Engine number mismatch again. Both your Registration Certificate and insurance policy become invalid with an engine swap
KarthikK is offline   Reply With Quote
Old 21st September 2011, 01:42   #8
BHPian
 
abhishek24x's Avatar
 
Join Date: Jan 2010
Location: PB08/PB10/HR26
Posts: 55
Thanked: 29 Times
Default Re: Bike Engine Swap Advice

Quote:
Originally Posted by Rennjit View Post
Yawn ..

Cool., can we have some details/ pics?

these are the initial pics that were lying with me in my laptop. The final model had a lot more changes like the whole front suspension was changed as well as the steering parameters. Mainly it was as 4x2, 150 cc ATV with real wheel drive. Final drive was via chain using my self designed chain-differential---the main USP. The differential was fabricated by mounting unicorn's rear sprocket on maruti 800's crown pinion(pic attached) I'll attach the final pics as well when i reach home..


Quote:
Originally Posted by Sutripta View Post
I would think it would be the other way around. Plonking an engine on a bed is easier than integrating it into a foreign chassis.

Regards
Sutripta
True.
But sir do you suggest my going in for that mod?? Atleast it'll feed my passion of automobile modification & will begin a new experiment for me to get busy with



Quote:
Originally Posted by ku69rd View Post
Mate,
What you gonna gain of it? understand if you are trying to build it to a purpose, here don't think it's gonna do a world of good. Can be done, but you might have to reinforce the chassis along the main tubes so that they get to handle the increased weight/speed/changed dynamics.
Changing the front forks is definitely on cards. Apart from it, is chassis reinforcement really needed?? People who go in for modifying their stock apache/karizma/r15 for track, do they also add something of this sort?? Please advice.



Quote:
Originally Posted by KarthikK View Post
the RC book would then contain an invalid/obsolete engine number after the swap; and what happens when the bike is sent for insurance renewal inspection? Engine number mismatch again. Both your Registration Certificate and insurance policy become invalid with an engine swap
For sure the old engine number will not be valid. Meanwhile i'll also check with the RTO regarding getting the new engine entered in the RC..


Note from Support: Posts merged.
Attached Thumbnails
Bike Engine Swap Advice-11022011100.jpg  

Bike Engine Swap Advice-11022011109.jpg  

Bike Engine Swap Advice-11022011104.jpg  

Bike Engine Swap Advice-11022011106.jpg  

Bike Engine Swap Advice-21092010071.jpg  

Bike Engine Swap Advice-21092010069.jpg  

abhishek24x is offline   Reply With Quote
Old 21st September 2011, 09:40   #9
Senior - BHPian
 
ku69rd's Avatar
 
Join Date: Sep 2009
Location: Bangalore
Posts: 2,249
Thanked: 1,181 Times
Default Re: Bike Engine Swap Advice

Quote:
Originally Posted by abhishek24x View Post
Changing the front forks is definitely on cards. Apart from it, is chassis reinforcement really needed?? People who go in for modifying their stock apache/karizma/r15 for track, do they also add something of this sort?? Please advice.
Track means it might need a bit more technical insight please excuse me for that as am not technically qualified enough to make a statement. You might have to consider facts like the rigidity of chassis, balance with the new additional weights inputted into it. But for moto-cross you would definitively need to reinforce the chassis with additional metal. Cause have seen stock bikes suffering at the fork/steering stem due to the weight impacts.

Regarding the ATV, were you using Drum brakes?

Last edited by ku69rd : 21st September 2011 at 09:42.
ku69rd is offline   Reply With Quote
Old 21st September 2011, 20:43   #10
Distinguished - BHPian
 
Join Date: Jul 2009
Location: Kolkata
Posts: 3,284
Thanked: 1,651 Times
Default Re: Bike Engine Swap Advice

Quote:
Originally Posted by abhishek24x View Post
....
True.
But sir do you suggest my going in for that mod?? Atleast it'll feed my passion of automobile modification & will begin a new experiment for me to get busy with
....
If you can afford it, thought it through, and have a fair idea of the consequences, by all means go for it.

I'm sure you have learned since building your ATV. Still, the pictures you have posted suggest that you have to do a lot more homework. Both design and workmanship.

Regards
Sutripta
Sutripta is offline   Reply With Quote
Old 25th September 2011, 13:37   #11
BHPian
 
abhishek24x's Avatar
 
Join Date: Jan 2010
Location: PB08/PB10/HR26
Posts: 55
Thanked: 29 Times
Smile Re: Bike Engine Swap Advice

Quote:
Originally Posted by ku69rd View Post
Track means it might need a bit more technical insight please excuse me for that as am not technically qualified enough to make a statement. You might have to consider facts like the rigidity of chassis, balance with the new additional weights inputted into it. But for moto-cross you would definitively need to reinforce the chassis with additional metal. Cause have seen stock bikes suffering at the fork/steering stem due to the weight impacts.

Regarding the ATV, were you using Drum brakes?
no i used disc brakes on all four wheels..
abhishek24x is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Turbo? NOS? Engine Swap? High CR NA build? How would you modify your engine? mclaren1885 Modifications & Accessories 61 13th July 2016 15:49
Fiat Palio - Engine Swap Advice manvirr Modifications & Accessories 11 15th November 2011 10:12
Engine Swap advice: Alto 1.1 in a M800 noidaboy Modifications & Accessories 12 6th August 2010 16:14
Safari TCIC 2.0 Engine swap with 3.0L DICOR Engine gd1418 Modifications & Accessories 34 6th July 2009 15:12


All times are GMT +5.5. The time now is 23:36.

Copyright 2000 - 2016, Team-BHP.com
Proudly powered by E2E Networks