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Replacement piston sets - Barrett?

 
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Harv



Joined: 01 Jul 2010
Posts: 154

PostPosted: Thu Oct 03, 2019 4:21 am    Post subject: Replacement piston sets - Barrett? Reply with quote

All

Can anyone confirm if the high compression piston and ring sets can be used with the Housai hs6 engines? I know they fit the yak (perhaps they’re interchangeable between m14p and hs6??)

Also are these only produced and sold by Barrett or are there other suppliers?

With thanks


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Richard.goode(at)russiana
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PostPosted: Thu Oct 03, 2019 10:46 pm    Post subject: Replacement piston sets - Barrett? Reply with quote

All the engines can accept high compression pistons, but the M 14 family pistons are different with a larger piston pin.

Richard Goode

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GeorgeCoy



Joined: 02 Dec 2010
Posts: 276

PostPosted: Fri Oct 04, 2019 5:09 am    Post subject: Replacement piston sets - Barrett? Reply with quote

Motorstar has manufactured higher compression pistons for the HS6a and the AI14 engines. The limitations are that users must use 100LL and due to the construction of the basic engine can only safely bump up the compression from 5.9 to 6.3.
George Coy
MotorstarNA
714 Airport Rd.
Swanton VT 05488
802-868-5633 off
802-363-5782 cell
george.coy(at)gmail.com
http://motorstarna.com/
SKYPE george.coy


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wlannon(at)shaw.ca
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PostPosted: Fri Oct 04, 2019 12:51 pm    Post subject: Replacement piston sets - Barrett? Reply with quote

Hi George;

The HS6a (285 HP) stock piston gives a compression ratio of 6.2 +/- 0.1.
The HS6 and AI14R (260 HP) engines are 5.9 +/- 0.1

Walt

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Harv



Joined: 01 Jul 2010
Posts: 154

PostPosted: Tue Oct 08, 2019 3:58 am    Post subject: Re: Replacement piston sets - Barrett? Reply with quote

Thanks for the replies which suggest there's only an upgrade piston for the HS6 engine (not the hs6a which already has 6.1:1 compression and therefore isn't really an "upgrade").

Does anyone know if Bill Blackwell is active still with CJ6's and what his contact details are, email address or web contact?

With thanks

Harv


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GeorgeCoy



Joined: 02 Dec 2010
Posts: 276

PostPosted: Tue Oct 08, 2019 5:49 am    Post subject: Replacement piston sets - Barrett? Reply with quote

We have produced two sets for clients at 6.3 to 1 (M14P compression ratio)
with the 3 ring SPC pistons. One for a Wilga and one for a CJ6. I do not
recall any significant performance increase reports other than the reduced
oil consumption due to the 3 ring pistons.

George Coy
MotorstarNA

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