1300 to 1641

clinker42 Officially Full-On Dubber

381 posts · joined Aug 2008 · 28 Nov 2009, 8:28 pm

#749675

Hi Guys

When you go from 1300 - 1640 cc with the barrel and piston kits, what do you normally do with the heads. Do people take some out of the chamber or just leave it the way it is.

Trev

Craig Torrens 6 times Australian, 7 times State Hillclimb Class Champion

8,040 posts · joined Jan 2003 · 29 Nov 2009, 9:21 am

#749719

when i convert i usually just put 1500 singleport or twin port 1600 heads.........you can machine the 1300 heads for the larger bore size, but the inlet and exhaust ports are smaller.

matberry Moderator Go hard or go home

8,114 posts · joined Mar 2006 · 29 Nov 2009, 1:24 pm

#749753

Craig Torrens wrote:when i convert i usually just put 1500 singleport or twin port 1600 heads.........you can machine the 1300 heads for the larger bore size, but the inlet and exhaust ports are smaller.

x2

Matt Berry Motorsports...air cooled advice, repairs and mods Ph 0408 704 662
OFF-ROAD,CIRCUIT,DRAG,STREET,ENDURANCE

clinker42 Officially Full-On Dubber

381 posts · joined Aug 2008 · 29 Nov 2009, 3:33 pm

#749781

So are 1600 twin ports differnt in the chamber to 1300 twin ports?

Craig Torrens 6 times Australian, 7 times State Hillclimb Class Champion

8,040 posts · joined Jan 2003 · 29 Nov 2009, 4:00 pm

#749788

yes......what are you converting a 1300tp or 1300 single ?

clinker42 Officially Full-On Dubber

381 posts · joined Aug 2008 · 29 Nov 2009, 8:07 pm

#749848

I have a 1300 TP and just rebuilt the bottom end, put in a scat cam and a 1641 barrel and piston kit. Im now wondering what the Compression ratio increase will be if I fit the standard 1300tp heads. They fit as I got the Barrels that have the same size top lip. Been thinking that the increase in cubes will be too much C/R for normal fuel.

Craig Torrens 6 times Australian, 7 times State Hillclimb Class Champion

8,040 posts · joined Jan 2003 · 29 Nov 2009, 8:20 pm

#749855

It will be fine.....TP 1300heads have 45cc combustion chambers and 1600heads have 51cc. (from memory)

It will work well. 👍

clinker42 Officially Full-On Dubber

381 posts · joined Aug 2008 · 29 Nov 2009, 9:34 pm

#749867

Thanks Graig

The CC'S have helped me heap, the 1300 heads will give me 9.5:1 and If I fit the 1600 heads I will have 8.5:1.
Maybe I will fit a copper head gasket to it and drop it down to around 9.2, what do you guys suggest for a beetle on unleaded.

Craig Torrens 6 times Australian, 7 times State Hillclimb Class Champion

8,040 posts · joined Jan 2003 · 29 Nov 2009, 9:51 pm

#749873

9.5:1 is fine as long as you run 95 octane.

What deck height are you running ?

dekkerboy Slammed & Awesome Dubber

96 posts · joined Oct 2009 · 14 Dec 2009, 1:49 pm

#752321

Just buy a 1600 motor.

jsheppard64 Officially Full-On Dubber

323 posts · joined Mar 2008 · 15 Dec 2009, 11:49 pm

#752643

dekkerboy wrote:Just buy a 1600 motor.

agreed
it does sound like less hassle.
but maybe they wanted to keep the engine number
plus he said he already had the cam in