DIY V-twin - SV650.org

CheGuevara · 20-01-10, 10:23 AM

Nothing to see

Bibio · 20-01-10, 11:19 AM

nice one.

ophic · 20-01-10, 11:42 AM

Push rod engine? Isn't that something of a limitation?

jambo · 20-01-10, 11:48 AM

Quote:

Originally Posted by ophic

Push rod engine? Isn't that something of a limitation?

Only really at high RPM, and, as these seem to be re-engineered JAP engines I don't think they'll rev that high

That must be a simply colossal amount of work. I was once told that even if you were to do a straight rebuild of period engines now they'd be more reliable simply because our understanding of metallurgy and materials are better. I assume these are fairly faithful reproductions with a few changes to aid reliability, but I'd be very interested in details!

The purists will probably be upset, but less so than if you took a modern engine and put it in a classic bike

Jambo

20-01-10, 11:52 AM

Gonna have to put it in something with a really odd frame design to accommodate those 'zausts

ophic · 20-01-10, 11:55 AM

They look quite compact - I reckon you could fit 3 of them in a custom frame

CheGuevara · 20-01-10, 12:24 PM

Quote:

Originally Posted by jambo

That must be a simply colossal amount of work. I was once told that even if you were to do a straight rebuild of period engines now they'd be more reliable simply because our understanding of metallurgy and materials are better. I assume these are fairly faithful reproductions with a few changes to aid reliability, but I'd be very interested in details!

It has been a monumental effort on his part and he's had to turn away a lot of paying work over the last couple of years. That said he has a few orders in already (from some seemingly wealthy people as these aren't cheap!) so hopes to be recovering some of his costs soon. You're right about the types of changes -I suspect mostly to address problems he's been frustrated by over years of rebuilding these for racing -things like oil passageways, materials etc (from memory that is- I'm sure there's plenty more).

CheGuevara · 20-01-10, 12:31 PM

Quote:

Originally Posted by ophic

They look quite compact - I reckon you could fit 3 of them in a custom frame

Not sure about actual dimensions, but I think it's 1100cc?

29-01-10, 04:47 AM

"DIY V-twin
Push rod engine? Isn't that something of a limitation? "

Not unless you want to go more than 185 mph

1955 Christchurch New Zealand Russell Wright Vincent - HRD 998 cc (60.9 cu in) 184.83 mph

World land speed record on a 998 push rod V twin Vincent.

ophic · 29-01-10, 11:09 AM

Quote:

Originally Posted by johnm

"DIY V-twin
Push rod engine? Isn't that something of a limitation? "

Not unless you want to go more than 185 mph

1955 Christchurch New Zealand Russell Wright Vincent - HRD 998 cc (60.9 cu in) 184.83 mph

World land speed record on a 998 push rod V twin Vincent.

I think my bike needs some push rods then. Make it go faster

20-01-10, 10:23 AM	#1
CheGuevara Member Join Date: Mar 2009 Posts: 478	DIY V-twin Nothing to see __________________ - K9 SV650S: Hel brake lines, carbon end can - SZR660: The project... - K5 SV650S: K7 GSXR750 front end, ZX6RR shock, GB Moto rearsets, Hel brake lines, Renthal risers, Tuono bars, V-Rod headlamp, "JMV" belly pan ~SOLD~ (wonder where it is now) Last edited by CheGuevara; 20-01-20 at 08:49 PM.

20-01-10, 11:19 AM	#2
Bibio Member Mega Poster Join Date: Jul 2008 Location: here as devil's advocate Posts: 11,541	Re: DIY V-twin nice one.

20-01-10, 11:42 AM	#3
ophic Member Mega Poster Join Date: Jan 2004 Location: Whyteleafe Posts: 3,395	Re: DIY V-twin Push rod engine? Isn't that something of a limitation? __________________ Silver SV650SK3, Fuel exhaust

20-01-10, 11:52 AM	#5
Neeja Guest Posts: n/a	Re: DIY V-twin Gonna have to put it in something with a really odd frame design to accommodate those 'zausts

20-01-10, 11:55 AM	#6
ophic Member Mega Poster Join Date: Jan 2004 Location: Whyteleafe Posts: 3,395	Re: DIY V-twin They look quite compact - I reckon you could fit 3 of them in a custom frame __________________ Silver SV650SK3, Fuel exhaust

29-01-10, 04:47 AM	#9
johnm Guest Posts: n/a	Re: DIY V-twin "DIY V-twin Push rod engine? Isn't that something of a limitation? " Not unless you want to go more than 185 mph 1955 Christchurch New Zealand Russell Wright Vincent - HRD 998 cc (60.9 cu in) 184.83 mph World land speed record on a 998 push rod V twin Vincent. Last edited by johnm; 29-01-10 at 04:49 AM.

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