Can a Rocket III take down the establishment, and rule this island

R-III-R Turbo

Mine is the biggest :)
Joined
Oct 12, 2010
Messages
1,962
Location
Ireland
Ride
2.5L Stroker Rocket III, Hayabusa
I'll bet they don't have many customers who order only 3 pistons!
Are they off the shelf pistons or custom ordered?

Well full disclosure I ordered enough for 2 sets and a spare, because race bike.
Completely custom made.

For enquiring minds, the stock combustion chamber volume I measured was 69cc, and the stock pistons 25cc dish;

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Gerald

Turbocharged
Joined
Dec 14, 2018
Messages
505
Location
Lou. Ky
Ride
05 Rocket 3
Small update here, got a handful of custom turbo pistons on order, 8.0:1 targeted.
Taking a step back to lower compression in order to take 2 steps forward by being able to cram twice as much air in there.

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Are these forged units, who's the manufacturer?
 

Gerald

Turbocharged
Joined
Dec 14, 2018
Messages
505
Location
Lou. Ky
Ride
05 Rocket 3
Forged 2618-T61 aluminium alloy, from my ever helpful friends in CP-Carrillo.

Some good reading from JE Pistons on material choice (LINK)
Either one is a good choice, forged is the key. I remember when Forged True was the industry premium. I owned several sets for different engine gassers I was running. Bought a set of JE`s from Neville for my bike.
 
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Neville Lush

www.nevillelushracing.com
Joined
Feb 26, 2007
Messages
951
Location
Victor Harbor South Australia
Ride
Speed Triple 1050 Dirt Track sidecar,H2750Roadrace sidecar W800 Kawasaki
I am wondering how you are going to get more boost? You can't spin the blower faster, as you are doing 9000 engine rpm anyway. The rotrex charger has a defined rev limit. Are you fitting a larger charger? If the compression is let down to stock ( which is 8.7) , then you will need different cam timing to avoid it being a complete and utter slug under 5000rpm. Mind you, that may help getting it off the line. I suggest you buy several sets of clutch plates and practise the launch a lot. :)
 

R-III-R Turbo

Mine is the biggest :)
Joined
Oct 12, 2010
Messages
1,962
Location
Ireland
Ride
2.5L Stroker Rocket III, Hayabusa
I was running a small custom made crank pulley, to spin the blower slower since the pistons were high comp, and maxing out around 7-8psi.
Switching to a 100mm crank pulley now which should run the blower at it's max of 100,000rpm assuming no belt slip. Aiming for 14-15psi.
 

R-III-R Turbo

Mine is the biggest :)
Joined
Oct 12, 2010
Messages
1,962
Location
Ireland
Ride
2.5L Stroker Rocket III, Hayabusa
Good to know, I think they're a 100mm crank pulley too so might get a few more psi from the 9000rpm engine. Although the 2.5L will consume a little more volume and counteract pressure increase.
I won't say no to more boost anyway..
 
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