B21 pistons in a B20

Oilline · Feb 25th, 2009, 22:40

Has anybody had experiance of fitting B21 pistons into a late 8 bolt B20?
I was wondering about where to get a head gasket to suit the increase in
bore diameter. Also where to buy a set of original quality Mahle pistons.

pookie · Feb 25th, 2009, 23:41

For all problems relating to head gaskets:-
www.ferriday.co.uk

Pookie

Derek UK · Feb 25th, 2009, 23:49

There are issues with the piston pins unless you're using the very late, rare in the UK, B20 rods/crank. Explanation here in the comments towards the bottom of the article. http://www.vclassics.com/archive/qbigbore.htm
Are you trying for turbo pistons? Not sure if they did them for 2.1l.

Oilline · Feb 26th, 2009, 07:27

My B20 is the later 8 bolt flywheel type so should have the 24mm little ends.
Was the 240GLT n0ot a turbo'd B21?

Derek UK · Feb 26th, 2009, 11:41

I'm not a 240 man but I think the UK GLT has the T standing for "Touring". Engine is B23E and the suspension wheels were upgraded in sporty fashion. A bit of Googling indicates that the 240 Turbo was a 2.1 so there should be some strong pistons around.
Did we get 240 Turbos in the UK? LHD only? Turbos and steering gear might get in each others way.

tdz840 · Apr 15th, 2011, 18:52

Just bought a late model B20 from a 1973ES. Has the 8 bolt crank.
Big plansds for the engine and start with the B21 pistons. Did you finsd a source for these and other bits such as the head gasket.
Any help or advice with the engine build greatly recieved!
Russ

john h · Apr 16th, 2011, 07:45

All UK market 240s were non-turbo. (Although there was dealer-fit carb+turbo kit available in the early days).

You might get OE 2.1 turbo pistons from overseas. Try turbobricks?

John

Burdekin · Apr 16th, 2011, 11:23

Mark and Russ, I got my head gasket for B21 pistons for my B20 head from KG Trimning in Sweden. I also got my pistons from them. Due to buying quite a bit postage was free. Worth giving KG a call as very helpful people. I also think you are correct that the 8 bolt has the 24mm little ends but KG will know for sure.

tdz840 · Apr 16th, 2011, 12:50

John/Mitch
Thanls for the advice; will give KG a call.
Never used turbobricks will have a look at the site
Russ

mad matt · Apr 23rd, 2011, 19:52

i've got a set ov 240 2.1 turbo pistons brand new if you won't them at a good pice

Feb 25th, 2009, 22:40	#1
Oilline Member Last Online: Jun 11th, 2017 19:24 Join Date: Apr 2007 Location: Skipton	B21 pistons in a B20 Has anybody had experiance of fitting B21 pistons into a late 8 bolt B20? I was wondering about where to get a head gasket to suit the increase in bore diameter. Also where to buy a set of original quality Mahle pistons. Last edited by Oilline; Feb 25th, 2009 at 23:11.

Feb 25th, 2009, 23:41	#2
pookie Premier Member Last Online: Apr 2nd, 2021 21:13 Join Date: May 2006 Location: Stockport	For all problems relating to head gaskets:- www.ferriday.co.uk Pookie __________________ Growing old disgracefully

Apr 15th, 2011, 18:52	#6
tdz840 VOC Member Last Online: Dec 14th, 2023 11:57 Join Date: Nov 2004 Location: fareham	Late model B20 Just bought a late model B20 from a 1973ES. Has the 8 bolt crank. Big plansds for the engine and start with the B21 pistons. Did you finsd a source for these and other bits such as the head gasket. Any help or advice with the engine build greatly recieved! Russ

Apr 16th, 2011, 07:45	#7
john h VOC Member Last Online: Yesterday 11:13 Join Date: Jan 2007 Location: Huddersfield View Photos By: john h	All UK market 240s were non-turbo. (Although there was dealer-fit carb+turbo kit available in the early days). You might get OE 2.1 turbo pistons from overseas. Try turbobricks? John __________________ XX

Feb 25th, 2009, 23:49	#3
Derek UK VOC Member Last Online: Today 15:25 Join Date: Jul 2006 Location: Chatham	There are issues with the piston pins unless you're using the very late, rare in the UK, B20 rods/crank. Explanation here in the comments towards the bottom of the article. http://www.vclassics.com/archive/qbigbore.htm Are you trying for turbo pistons? Not sure if they did them for 2.1l.

Feb 26th, 2009, 07:27	#4
Oilline Member Last Online: Jun 11th, 2017 19:24 Join Date: Apr 2007 Location: Skipton	My B20 is the later 8 bolt flywheel type so should have the 24mm little ends. Was the 240GLT n0ot a turbo'd B21?

Feb 26th, 2009, 11:41	#5
Derek UK VOC Member Last Online: Today 15:25 Join Date: Jul 2006 Location: Chatham	I'm not a 240 man but I think the UK GLT has the T standing for "Touring". Engine is B23E and the suspension wheels were upgraded in sporty fashion. A bit of Googling indicates that the 240 Turbo was a 2.1 so there should be some strong pistons around. Did we get 240 Turbos in the UK? LHD only? Turbos and steering gear might get in each others way.

Apr 16th, 2011, 11:23	#8
Burdekin Chief Bodger Last Online: Today 13:39 Join Date: Oct 2009 Location: Aberdeen	Mark and Russ, I got my head gasket for B21 pistons for my B20 head from KG Trimning in Sweden. I also got my pistons from them. Due to buying quite a bit postage was free. Worth giving KG a call as very helpful people. I also think you are correct that the 8 bolt has the 24mm little ends but KG will know for sure.

Apr 16th, 2011, 12:50	#9
tdz840 VOC Member Last Online: Dec 14th, 2023 11:57 Join Date: Nov 2004 Location: fareham	John/Mitch Thanls for the advice; will give KG a call. Never used turbobricks will have a look at the site Russ

Apr 23rd, 2011, 19:52	#10
mad matt Senior Member Last Online: Jul 12th, 2023 21:10 Join Date: Jun 2009 Location: amlwch	i've got a set ov 240 2.1 turbo pistons brand new if you won't them at a good pice

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