Piston Scratched - Exhaust side

Reply Subscribe

Thread Tools

Search this Thread

10-12-2011 | 12:13 AM

#16

Sp Racer

Tech Master

iTrader: (12)

Joined: Dec 2002

Posts: 1,657

From: Melbourne, Australia

Quote:

Originally Posted by wingracer

Castor definitely helps, especially with low castor fuels like the OD speed blend and 9% Byrons.

Spot on.

We were using a synthetic only based fuel for a while , lunched probably 1/2 dozen engines is exactly the same way until we figured out what was going on.

Add castor FTW

10-12-2011 | 12:54 AM

#17

GREGORY!

Tech Master

iTrader: (1)

Joined: Jun 2006

Posts: 1,110

From: Greece

Quote:

Originally Posted by Sp Racer

Spot on.

We were using a synthetic only based fuel for a while , lunched probably 1/2 dozen engines is exactly the same way until we figured out what was going on.

Add castor FTW

1/2 dozen engines?expensive lesson!how much FTW did you add ?

10-12-2011 | 01:19 AM

#18

Sp Racer

Tech Master

iTrader: (12)

Joined: Dec 2002

Posts: 1,657

From: Melbourne, Australia

Quote:

Originally Posted by GREGORY!

1/2 dozen engines?expensive lesson!how much FTW did you add ?

Yep , call it blind loyalty

We switched fuel and have never had an issue - 5% caster / 5% synth

10-12-2011 | 03:57 AM

#19

peppernick

Tech Regular

iTrader: (3)

Joined: Jun 2010

Posts: 397

It's the fuel, more specifically the oil, or lack of. I damaged my Kangaroo the same way using OD Speedblend. I have allowed adequate running in (1 gallon) but the piston seized several times during runs when I was trying to race tune the engine.

Speedblend contains 7.5% oil. Too little for on-road. I have since switched to Cosmo (12-14% oil).