View Full Version : High compression piston kit
weecorey
23-11-09, 07:45 PM
Anyone know where you can buy a wiseco highcompression piston kit? I'm looking to do some work to my SV650 race bike, considering carrillo rods also.
Thanks in advance.
You had better put a few cranks on your shopping list too!!
yorkie_chris
24-11-09, 04:54 PM
Why not 'busa pistons and skim head, cheaper and probably lighter.
beabert
24-11-09, 05:00 PM
Im gonna say it, flog it, get a faster bike for racing to start with then get pistons for that instead :D.
weecorey
24-11-09, 05:50 PM
You had better put a few cranks on your shopping list too!!
I know Yvonne, everyone you ask about engine work gives you a different recomendation! Not 100% what I want to do yet but theres going to be alot of SV's on the grid next year, its a pitty but it seems you have to do something with the engine to have a chance of competing.
Im gonna say it, flog it, get a faster bike for racing to start with then get pistons for that instead :D.
Nah, love the SV!
RGV250ads
24-11-09, 08:36 PM
Try Steve Jordan's. He's running that gear in his SV700 thunderbike.
HTH.
I know Yvonne, everyone you ask about engine work gives you a different recomendation! Not 100% what I want to do yet but theres going to be alot of SV's on the grid next year, its a pitty but it seems you have to do something with the engine to have a chance of competing.
Nah, love the SV!
As long as yer not more than 650cc ;)
Someone is going to get caught out - there were several stripped at the road races this year - all were ok but sooner or later.....
weecorey
26-11-09, 06:28 PM
I know there is a few biguns out there and the sooner they are caught the better for the rest of us!
suzuki139
28-11-09, 09:36 PM
As long as yer not more than 650cc ;)
Someone is going to get caught out - there were several stripped at the road races this year - all were ok but sooner or later.....
they would need to make a bit more of a effort when checking them, you dont have to bore them out to make them 700cc
yorkie_chris
29-11-09, 10:45 AM
No but I don't think going long-stroke would be the best thing for them.
Why don't they just check like in F1 pylon racing? Fill cylinder with oil and measure volume.
suzuki139
29-11-09, 11:17 AM
No but I don't think going long-stroke would be the best thing for them.
Why don't they just check like in F1 pylon racing? Fill cylinder with oil and measure volume.
chris that would be to much work for them...
yorkie_chris
29-11-09, 11:20 AM
So instead they remove head and measure bore?!
suzuki139
29-11-09, 12:14 PM
that would be correct chris..
Be careful lads and dont waste your precious pennies. Minitwins have strict limits on output (72 BHP) and at Bemsee for example you can expect to be put on the dyno at regular intervals throughout the season. It has been known for protests to be put in, so you could lose any credibility if caught cheating as well as disqualification from rounds current, past and future. Of course if you want to play around with the power weight ratio then off to thunderbikes for you.
The SV block should make 72 BHP comfortably with a race can and system (legal), ecu or power commander and mapping (legal) and race filter (legal). It doesnt need mechanical tampering. Or cheating.
Of course you could also try and be a better rider, or get your suspension set up bang on, or even buy some nice sticky tyres (all legal)
coxxy
yorkie_chris
06-12-09, 01:13 PM
Who says he is in minitwins?
weecorey
06-12-09, 01:43 PM
Be careful lads and dont waste your precious pennies. Minitwins have strict limits on output (72 BHP) and at Bemsee for example you can expect to be put on the dyno at regular intervals throughout the season. It has been known for protests to be put in, so you could lose any credibility if caught cheating as well as disqualification from rounds current, past and future. Of course if you want to play around with the power weight ratio then off to thunderbikes for you.
The SV block should make 72 BHP comfortably with a race can and system (legal), ecu or power commander and mapping (legal) and race filter (legal). It doesnt need mechanical tampering. Or cheating.
Of course you could also try and be a better rider, or get your suspension set up bang on, or even buy some nice sticky tyres (all legal)
coxxy
I race supertwins in Ireland, no BHP limit just 650cc. Wish it was limited to 72BHP as it would be a hell of alot cheaper!
Who says he is in minitwins?
I know I'm not in Minitwins, supose he reckons I am because of the catagory the thread is in, should make it an SV racing catagory to cover every one.
so are we agreed then the minitwins thread is for......................minitwins?! Not that I mind at all but: Just so we dont confuse the rooky readers? :salut:
weecorey
07-12-09, 07:53 PM
Got the bike on the dyno today, wanted to get a figure before I do any work so I know what i'ved gained when I'm finished, at the minute its 73.1 BHP, the guy who done it built another engine in the supertwins which is putting out 89BHP! :smt118 If I can get 80BHP when I'm finished I'll be happy :thumright:
yorkie_chris
07-12-09, 08:42 PM
With what work?
weecorey
07-12-09, 08:54 PM
With what work?
I take it your asking about the 89BHP bike, high compression pistons, carrillo rods, lightend fly wheel, gass flowed head with race cams, and alot of tweeking I believe.
Does he do any work on the gearbox?
Any there any supertwins guys running into gearbox problems with such significant power increases?
A guy I know who races the roads here has his SV doing 84bhp with standard bore running high comp pistons,porting,cams,PC and a Hindle system. I feel the 80 bhp mark can be reached easily and safely. He raced his bike for a full season and never touched a thing nor had any problems. Im hoping to achieve high 70-low 80 bhp with mine for next season :cool:
weecorey
08-12-09, 06:48 PM
A guy I know who races the roads here has his SV doing 84bhp with standard bore running high comp pistons,porting,cams,PC and a Hindle system. I feel the 80 bhp mark can be reached easily and safely. He raced his bike for a full season and never touched a thing nor had any problems. Im hoping to achieve high 70-low 80 bhp with mine for next season :cool:
I orderd my rods and pistons yesterday from the US, a guy on here SV race parts, his name is blair. Great price and very helpfull, the Carrillo rods are on back oder so wont get them till end January, went with the Wiseco 645cc High compression pistons. Are you getting your heads ported and cams re-profiled? If so who is doing the heads for you? I've priced it with a few people but I'm still looking around. Did you race here this year?
I orderd my rods and pistons yesterday from the US, a guy on here SV race parts, his name is blair. Great price and very helpfull, the Carrillo rods are on back oder so wont get them till end January, went with the Wiseco 645cc High compression pistons. Are you getting your heads ported and cams re-profiled? If so who is doing the heads for you? I've priced it with a few people but I'm still looking around. Did you race here this year?
The guy Im talking about ran standard rods and JOG Tuning done his engine work. I only done the Mondello rounds this year in the SS600 on my old R6 to get into the swing of things. I recognise your name for Cleggys site. If any engine work is being done Im gonna tackle as much as I can myself along with my buddys help(nothing I have built has blown up yet). im also looking into the idea of running the Hayabusa pistons to keep costs down. Must do more research into that though
SV650Racer
09-12-09, 01:28 PM
Does he do any work on the gearbox?
Any there any supertwins guys running into gearbox problems with such significant power increases?
We havent come across any gearbox issues as yet and are running 90bhp on a dynapro dyno. The only thing Steve is now running is a new design of slipper clutch from Sigma as the original ones were getting excessive wear on the pressure plate due to the extra torque produced over stock.
We are now though running a Nova full close ratio box in his SV700 and trialing a new race generator which will help in reducing the weight off that side of the crank at high rpm. May go someway to saving a set of crankcases :smt043
We wont do any tuning work to them without adding carrillo rods. The stock items are just too weak ideally. One of them lets go and you trash the head at the very least. You just have to watch out for some copies that were floating around having been made by another UK based tuner. They are slightly out of spec (too short) and loose you compression and BHP. Not ideal!
The Hayabusa pistons dont give as much as the wiseco's. About 2-3bhp at mid to high rpm less.
Emmet - did you get my mail re the valve/headwork?.
weecorey
09-12-09, 05:58 PM
Emmet - did you get my mail re the valve/headwork?.
Don't believe I did, I've been on to that many people. The last email I sent you was requesting a quote for the heads gas flowed and valves with a 3 angle cut. I'll send the heads to you and pay for return postage. Cheers
hi i cleaned my own heads up with a dremmel type machine and fitted a pair of kent cams power commander put it on a dynojet dyno and 1 hour later 79.8 bhp not bad easy to do the heads as well
hi i cleaned my own heads up with a dremmel type machine and fitted a pair of kent cams power commander put it on a dynojet dyno and 1 hour later 79.8 bhp not bad easy to do the heads as well
Well done,fair play. Did you match the exhaust ports to the exhaust using the Dremmel thingy or what did you do??
yorkie_chris
09-12-09, 10:26 PM
Got some spare heads to give that treatment myself. I was thinking just polish up the inlets a few grades and finely radius the point in between the ports, same treatment to exhaust.
Exhaust doesn't look too bad a shape to start with, just bad surface finish, not sure how much you could smooth flow out without making port too big and losing velocity?
Probably better to keep it to a basic polish and clean up for me...
Well done,fair play. Did you match the exhaust ports to the exhaust using the Dremmel thingy or what did you do??
cheers just concentrated on the inlet side more than anything by taking a fair bit out and even taking a lot off the valve guide and knife edge the web on the exhaust side just cleaned it out a bit all in all got it from 72 bhp to 79.8 for the price of 260 i think for the cams and 60 for the gaskets i has got old of a load of shims as these had to be altered a lot even had to create a new shim table in the haynes manual as they didnt have the sizes wrote down i needed it has been raced for a season and half and is reliable.
yorkie_chris
09-12-09, 10:50 PM
If I am feeling nice(flush!) when I do mine I might dyno before and after. Already got some JHS cams in there
SV650Racer
10-12-09, 09:13 AM
Don't believe I did, I've been on to that many people. The last email I sent you was requesting a quote for the heads gas flowed and valves with a 3 angle cut. I'll send the heads to you and pay for return postage. Cheers
No probs will check my emails and check whether it went. Have been out alot over the past few weeks so not always in the shop.
Got some new cam profiles to test too soon on steves bike once we firm some testing dates up. Plus some valve settings after chatting with one of the bsb teams. Cant wait now for next year!
lukemillar
10-12-09, 09:37 AM
so are we agreed then the minitwins thread is for......................minitwins?! Not that I mind at all but: Just so we dont confuse the rooky readers? :salut:
Mini-twins section is too specific anyway. I'd rather see it renamed to "club-racing". That way it encompasses all guises an SV can take in the race world.
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