57mm Pistons

Forum rules
Please can you post items for sale or wanted in the correct For Sale section. Items / bikes for sale here will be removed without warning. Reasons for this are in the FAQ. Thanks
Post Reply
User avatar
CMSMJ1
Moderators
Moderators
Posts: 7153
Joined: Thu May 01, 2008 9:42 am
Bike owned: NC30-No9
Location: Chesterfield, United Kingdom
Re: 57mm Pistons

Post by CMSMJ1 »

Thanks Mike,

Just cannot afford your pistons right now..or maybe ever.. :cry:

Need a better job I think..more cash = more NC goodies :mrgreen:
IMPERATOR REX ANGLORUM

The V4 is the law..

NC30 - No9 - my old mate
Top
leon
Settled in member
Posts: 15
Joined: Mon May 05, 2008 7:56 pm
Contact:
Contact leon
Re: 57mm Pistons

Post by leon »

.
Last edited by leon on Tue Nov 18, 2008 6:52 pm, edited 1 time in total.
Top
RVF
Settled in member
Posts: 111
Joined: Wed Apr 30, 2008 8:22 pm
Location: Cornwall, England
Re: 57mm Pistons

Post by RVF »

How do you loose cam duration by shimming the cam carriers up?
Top
g-force performance
Familiar Member
Posts: 288
Joined: Thu May 29, 2008 5:58 am
Bike owned: VTR-250, VFR400RR,
Location: Santa Clara County, California, USA
Contact:
Contact g-force performance
Re: 57mm Pistons

Post by g-force performance »

RVF wrote:How do you loose cam duration by shimming the cam carriers up?
The relationship between the cam lobe and the rocker arm can have an affect on cam timing. However, it is miniscule and all of our shimmed (shaved & shimmed) heads all run great (71hp to 74hp on a 400cc motor with stock pistons)
Top
RVF
Settled in member
Posts: 111
Joined: Wed Apr 30, 2008 8:22 pm
Location: Cornwall, England
Re: 57mm Pistons

Post by RVF »

Thats my point, You dont loose anything. You'd have to not reshim it to loose duration.

We shim all the factory RVF750 engines cam carriers and tip the gear trains in the RC45 to get the right backlash clearances as well as mechining the heads and/or cases and dont loose any duration form doing it.
Top
g-force performance
Familiar Member
Posts: 288
Joined: Thu May 29, 2008 5:58 am
Bike owned: VTR-250, VFR400RR,
Location: Santa Clara County, California, USA
Contact:
Contact g-force performance
Re: 57mm Pistons

Post by g-force performance »

Piston Update:

Cosworth is designing and making our new pistons as we speak. I have been working directly with the Principal Engineer of Cosworth Ltd. We should be seeing 48 pistons (12 sets) in the next 4 to 6 weeks. Of those 12 sets, we will have 4 or 5 sets available for resale. The pistons are being made to use in 5 configurations:

Standard Stroke, Standard Rods 57mm = 428cc
(yes, you can use stock crank & rods, just bore the stock cases, rebalance the crank, rebuild and go!!!!)
Standard Stroke, +1.25mm Long Rods 57mm = 428cc
Standard Stroke, +3.00mm Long Rods 57mm = 428cc
Increased Stroke +2.50mm, Standard Rods 57mm = 454cc
Increased Stroke +2.50mm, +1.75mm Long Rods 57mm = 454cc

The will cost me approximately $1,000.00 USD per set of 4 which includes Pistons, Pins and Circlips.
Rings are not included in that price and they run about $250.00 USD per set of 4

If anyone is seriously interested I need to know in the next 2 weeks. I will need cash delivered by the time they bill me, so in about 5 weeks. Please speak up now. I believe I need to order 48 pistons everytime I get any made. So, it will be a long time before I ever get more made - if ever.

Mike Norman
G-Force Engine Development
267 Houret Drive
Milpitas, CA 95035 USA
(408) 244-8090
http://www.mngforce.com
Top
Post Reply

Return to “Honda - General”