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ilovemypug

Tu 1.1 Bottom End With Tu3S Head And Carb

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ilovemypug

As mentioned in the title, has anyone done this and if so any good? Have to keep the cc in the engine stock but want some more umpff.

 

Also thinking of going bike carb direction? Have to keep it all as low profile as possible and all mechanical, no electronics envolved ie itbs etc.

 

Any ideas, suggestions welcome.

 

Im about to resurrect an XR that needs some TLC as it has been parked for 5 years.

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dawning

Heads are the same just the cam is different in the tu3s and the carb.

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calvinhorse

Heads are the same just the cam is different in the tu3s and the carb.

I thought the ports were bigger

 

I'm sure the inlet Valves are bigger on the tu3s

 

Possibly different cc combustion chamber too

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ilovemypug

See if Sandy comes along and shines us with his wisdom =)

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ilovemypug

Bump

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RossD

Very subtle differences on the TU3S ports compared to the more normal TU1 and TU3 heads. Cam is different, valve sizes are the same. Combustion chamber the same, hence compression is the same.

Identifiable from the '3S' cast into the top of the head itself.

Edited by RossD
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calvinhorse

The inlet ports are a good 5-6mm bigger on the xs compared to the 1.1 I had a look yesterday, exhausts look very similar.

 

Does anybody know how to identify the xs cam? I've got what I believe is a 1.4 tu3 and a 1.4 tu3s cam

 

One is stamper 'A' the other stamped 'R'?

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Anthony

I've got a TU3S cam in the garage so I can check later this week if you don't find an answer in the meantime

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calvinhorse

That would be ace Anthony, the stamp is on the fuel pump end, easy to spot

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Anthony

Sorry for the delay, but having finally had chance to dig it out and check, my TU3S cam is stamped "R" :)

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calvinhorse

Brilliant, thanks Anthony much appreciated

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ilovemypug

thank you!

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ilovemypug

would there be any point in skipping the tu3s head and put euro rallye head? im in portugal from time to time they show up- Or a tu3j head off a 106 rallye? can get one for 60€

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ilovemypug

right now there is a complete head (head, camshaft, rockers) for 250€

 

and a 106 rallye head for 60€

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RossD

The TU heads with the 39mm inlet valves (So 106 Rallye, 205 euro rallye etc) have a bigger combustion chamber. Fitting one of these to your engine would see the compression ratio drop, impacting the output and driveability. 

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ilovemypug
3 hours ago, RossD said:

The TU heads with the 39mm inlet valves (So 106 Rallye, 205 euro rallye etc) have a bigger combustion chamber. Fitting one of these to your engine would see the compression ratio drop, impacting the output and driveability. 

Yes Im aware of this. Would have to skim the head. And then there is the fact that the rallye tu2j and tu5j cams have bigger bearings and no fuel actuator lobe... Just found on today for 30 euro.. 

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