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Renaissa

Yamaha sport bike with basically a dual carb 250 Virago engine.
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Re: Renaissa

PostAuthor: xkisax » Mon Feb 20, 2017 1:32 pm

A little update.
Just made a fiberglass battery box to free some space under the seat for turbine and carb.
I know it's ugly but strong enough.

Image
Image
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xkisax
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Bike year & model: '97 srv 250 renaissa
'13 LML Star 200
Sex: Male

Re: Renaissa

PostAuthor: JrZook » Mon Feb 20, 2017 7:56 pm

xkisax wrote:I follow all of your threads. Great work, you have done as much work by yourself as entire workshop crew. I'm your fan, really.
And yes I'm very interested in results of your ignition controller road tests.


Cheers for the plug mate and keep me updated if you do happen to come across another 6-speed gear set. Would really be keen to get my hands on one of them for my turbo engine build!

Where are you thinking of mounting your turbo? The SRV must be similar to the XV in some aspects RE: no space! Was so tricky to find a practicable yet functional place to mount my GT06
Engine Specs:___________________________________Bike Specs:
HE 285cc_______________________________________FZR250 twin disc front end
52.4mm ceramic/teflon coated flat top pistons_________GSX600F handle bars
Wiseco TTR125 intake/exhaust valves_______________Relocated rear shocks
TTR125 valve springs_____________________________17/40 sprocket
Ported heads, 3 angle seat cuts_____________________XV700 Tacho
SRV250 cams on custom needle roller bearings________Metzler Lazertech tires
Twin Mikuni BDS26 carbs__________________________Custom 2-1 exhaust
Lightened rotor__________________________________Harley sportster muffler
XT250 clutch pack
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JrZook
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Posts: 1385
Images: 4
Joined: Mon May 11, 2009 10:49 pm
Location: Brisbane Flag
Bike year & model: '94 XV250 Sui-Cycle!
Sex: Male

Re: Renaissa

PostAuthor: JrZook » Mon Feb 20, 2017 8:08 pm

xkisax wrote:Image

And just for reference regarding top end weights:
JrZook wrote:Few more measurements for those interested. I finally got hold of a set of precision scales and this is what I found:

Stock piston + Rings + pin + clips = 97.9g
New piston + rings + pin + clips = 112.6g

The difference here is 14.7g or 15% increase in top end weight

Another few figures:

Yamaha pin = 21.2g , New pin 23.6g difference 2.4g or 11%

I will be using the standard Yamaha pin as it fits nicer in the new pistons so this will bring the weight percentage increase down to 12.5% with a total weight of 110.2g

Im running 10% heavier than stock on my 52.4mm engine but no vibes to report, if anything its actually smoother... Maybe your was a combination of the weight, high compression and very large bore?

Dan
Engine Specs:___________________________________Bike Specs:
HE 285cc_______________________________________FZR250 twin disc front end
52.4mm ceramic/teflon coated flat top pistons_________GSX600F handle bars
Wiseco TTR125 intake/exhaust valves_______________Relocated rear shocks
TTR125 valve springs_____________________________17/40 sprocket
Ported heads, 3 angle seat cuts_____________________XV700 Tacho
SRV250 cams on custom needle roller bearings________Metzler Lazertech tires
Twin Mikuni BDS26 carbs__________________________Custom 2-1 exhaust
Lightened rotor__________________________________Harley sportster muffler
XT250 clutch pack
User avatar
JrZook
Silver Membership
Silver Membership
 
Posts: 1385
Images: 4
Joined: Mon May 11, 2009 10:49 pm
Location: Brisbane Flag
Bike year & model: '94 XV250 Sui-Cycle!
Sex: Male

Re: Renaissa

PostAuthor: xkisax » Sat Apr 08, 2017 3:12 am

Im running 10% heavier than stock on my 52.4mm engine but no vibes to report, if anything its actually smoother... Maybe your was a combination of the weight, high compression and very large bore?

After reading some books, papers and forums about v-twin engine balancing now I think that balancing is sort of art, not engineering. There is a balancing factor in counterweight calculations that nobody can determine and nobody can explain how it can be found. It's empiric value. harley fans was like: "My father and his father always uses a 55%(or 50%, or 60%) balance factor. I don't know where it came from but I will continue this tradition". So 10% weight difference can't cause high vibrations, more likely fuel detonation due to high compression can.

Finally I've received my new carillo conrods and adjustable wastegate actuator.
From left to right: srv's, xv's, carrillo's rods.
Image
11 grams lighter than stock, two times stronger.
Now i have all major parts of bike, just need to assemble them together.
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xkisax
Junior Membership
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Posts: 20
Joined: Mon Jan 20, 2014 5:49 am
  Flag
Bike year & model: '97 srv 250 renaissa
'13 LML Star 200
Sex: Male

Re: Renaissa

PostAuthor: JrZook » Mon Apr 10, 2017 11:12 pm

Nice rods man! Now you're making me nervous about using my XV rods with boost :ops:
Sent you a pm

Dan
Engine Specs:___________________________________Bike Specs:
HE 285cc_______________________________________FZR250 twin disc front end
52.4mm ceramic/teflon coated flat top pistons_________GSX600F handle bars
Wiseco TTR125 intake/exhaust valves_______________Relocated rear shocks
TTR125 valve springs_____________________________17/40 sprocket
Ported heads, 3 angle seat cuts_____________________XV700 Tacho
SRV250 cams on custom needle roller bearings________Metzler Lazertech tires
Twin Mikuni BDS26 carbs__________________________Custom 2-1 exhaust
Lightened rotor__________________________________Harley sportster muffler
XT250 clutch pack
User avatar
JrZook
Silver Membership
Silver Membership
 
Posts: 1385
Images: 4
Joined: Mon May 11, 2009 10:49 pm
Location: Brisbane Flag
Bike year & model: '94 XV250 Sui-Cycle!
Sex: Male

Re: Renaissa

PostAuthor: JrZook » Sun Jul 30, 2017 8:37 pm

Any updates mate? :cl:
Engine Specs:___________________________________Bike Specs:
HE 285cc_______________________________________FZR250 twin disc front end
52.4mm ceramic/teflon coated flat top pistons_________GSX600F handle bars
Wiseco TTR125 intake/exhaust valves_______________Relocated rear shocks
TTR125 valve springs_____________________________17/40 sprocket
Ported heads, 3 angle seat cuts_____________________XV700 Tacho
SRV250 cams on custom needle roller bearings________Metzler Lazertech tires
Twin Mikuni BDS26 carbs__________________________Custom 2-1 exhaust
Lightened rotor__________________________________Harley sportster muffler
XT250 clutch pack
User avatar
JrZook
Silver Membership
Silver Membership
 
Posts: 1385
Images: 4
Joined: Mon May 11, 2009 10:49 pm
Location: Brisbane Flag
Bike year & model: '94 XV250 Sui-Cycle!
Sex: Male


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