Tim Lynch bikes

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Tim Lynch bikes

Post  tdl1325 on Tue 1 Feb - 20:17



1952 BSA M33 road legal sprinter.
Featured on Carole Nash stand at NEC and in CN Calendar 2010.




B33 Engine detail.




As featured in Brit Bike Forum Calendar 2011.




Sprinter: Drive side.




Photoshop image of how Sprinter could look with Jawa DOHC 4V top end (when I get the engine finished!).




1949 BSA M33.






Last edited by tdl1325 on Mon 26 Mar - 11:54; edited 3 times in total (Reason for editing : Text update & extra pics added)
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Question about Jawbsa

Post  janh on Mon 16 May - 19:31

Hello Tim, I like your bikes a lot. I have been building a caferacer with a Jawa 895 engine. See: personal album of janh. Do you run it on petrol? If you do, what kind of piston do you use to get the compression ratio down and with a piston oil ring? I am having some problems with that. Thanks, regards, Jan Heikens, Holland.

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JAWA 895

Post  tdl1325 on Mon 16 May - 22:39

Jan,

Engine is not completed yet but well on the way. I will be reducing the compression ratio down to about 10.5:1 by using a 163mm GM speedway conrod and a 90.5mm JE flat topped piston in the 895 barrel. I will then recess a 2mm thick squish plate into the top of the barrel to increase the combustion volume. Camshaft drive comes from an extra spindle and drive gear with sprocket welded to it. See pics attached.










Last edited by tdl1325 on Mon 26 Mar - 11:52; edited 2 times in total
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Thanks

Post  janh on Tue 17 May - 13:08

Thanks for the quick response and the pictures. We both use different crank cases, but the piston looks like something I could use to bring the compression down. Good luck with finishing your motorbike, I'm really curious about the result. Gr. Jan.

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Jawa 895

Post  tdl1325 on Tue 17 May - 14:29

Jan,

I also contemplated using a Suzuki DRZ 400 (89.5mm) piston which has a 20mm pin. I will use in future, a Ducati 916 (94mm) piston. Both have deck heights lower than the JE piston so its really a case of finding the right height for your conrod/crank stroke length. The 895 barrel with a steel liner has plenty of room for the bigger pistons. The 895 head has a combustion volume of 33cc so my squish plate mod gives me a lower compression ratio by increasing combustion volume by about 12cc and still maintains the squish clearance of 1mm needed for good combustion. I will be running it on 98 or 99 octane petrol at between 10.5 to 11:1 CR depending on head gasket thickness.
Hope this helps.

Tim.
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thanks

Post  janh on Wed 18 May - 9:14

I'm learning all the time. I'm thinking about having a custom JE piston made, a flat top dish piston. Looking at the options now. And yes this helps me a lot, thanks, Jan.

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Re: Tim Lynch bikes

Post  650zed on Wed 18 May - 9:50

Please read the rules of this section:
http://classicbikes.actieforum.com/t1570-important-please-read-this-before-creating-your-album

The idea is to post only pics, not to comment or reply, in order to keep this section "clean".

All comments, answers and replies are welcome under section "Show us your project".

Thanks

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JABSA 566

Post  tdl1325 on Tue 31 Jan - 13:09



BSA M20 frame, BSA B31 bottom end, Jawa 894 DOHC 4v head and barrel. Bore & Stroke 90.5 x 88 = 566cc.
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Re: Tim Lynch bikes

Post  tdl1325 on Mon 26 Mar - 11:56



Stainless exhaust fitted, seat re-covered, mudguards and oil tank re-painted.



Twin Leading Shoe front brake conversion now complete.





Last edited by tdl1325 on Sat 23 Jun - 1:57; edited 2 times in total (Reason for editing : TLS front brake mod)
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Re: Tim Lynch bikes

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