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rannsachair
V4 Beginner

United Kingdom
90 Posts

Posted - 25 Jan 2019 :  22:40:28 Show Profile Reply with Quote
I picked up a spare set of heads and was looking at fitting larger valves, any advice on what to buy: I see Burton advertise 2.8 V6 Taunus valves, 1-1/2 exhaust and 42.1 mm inlet - will they suit?

I will put in new guides while I am at it, again I see Burton sell cast iron and bronze, as well sticking with cast iron?

Thanks

Britishfoxy
Starting Member

5 Posts

Posted - 30 Jan 2019 :  15:23:44 Show Profile Reply with Quote
im looking at doing the same what i would say yes those are the valves that will fit work out the cost of parts but go see a machine shop about cost of getting the work done on the heads
to fit them and get a rought price with them getting the parts too as they usually can get a discount on parts, may as well get hardened inserts fitted too so you can run unleaded too :)
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rannsachair
V4 Beginner

United Kingdom
90 Posts

Posted - 30 Jan 2019 :  17:07:26 Show Profile Reply with Quote
quote:
Originally posted by Britishfoxy
im looking at doing the same what i would say yes those are the valves that will fit work out the cost of parts but go see a machine shop about cost of getting the work done on the heads
to fit them and get a rought price with them getting the parts too as they usually can get a discount on parts, may as well get hardened inserts fitted too so you can run unleaded too :)

Thanks, I was planning to do the work myself, i picked up a spare set of heads with hardened seats.
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TTruckie
V4 Fanatic

United Kingdom
295 Posts

Posted - 05 Feb 2019 :  18:15:28 Show Profile Reply with Quote
Chat to the guys at Burton. It is effectively 2/3 of a cologne V6 and they advised me. Cant remember the size but they are big valves that they recommended.
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Derek
V4 Guru

United Kingdom
1845 Posts

Posted - 06 Feb 2019 :  12:06:11 Show Profile Reply with Quote
Note that bigger valves won't do much without the inlet and exhaust being upgraded along with a better cam and exhaust system. Possibly higher compression too. Just fitting the larger valves can slow the gas flow speeds and that's not good. On a standard engine, a Jetex exhaust will pull the gas out a bit better and using the 34ICH allow a bit more fuel in when needed. Nothing major but a useful bit of extra poke. No new information there but worth mentioning.
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melle
V4 Guru

United Kingdom
2673 Posts

Posted - 06 Feb 2019 :  12:47:24 Show Profile Visit melle's Homepage Reply with Quote
I believe that <5500rpm big valves don't do much, apart from maybe robbing low/ mid range torque if the rest of the engine build isn't very, very well considered.

www.saabv4.com
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rannsachair
V4 Beginner

United Kingdom
90 Posts

Posted - 06 Feb 2019 :  13:08:17 Show Profile Reply with Quote
quote:
Originally posted by Derek
Note that bigger valves won't do much without the inlet and exhaust being upgraded along with a better cam and exhaust system. Possibly higher compression too. Just fitting the larger valves can slow the gas flow speeds and that's not good. On a standard engine, a Jetex exhaust will pull the gas out a bit better and using the 34ICH allow a bit more fuel in when needed. Nothing major but a useful bit of extra poke. No new information there but worth mentioning.


Thanks to Melle, it is a 1700 with a twin choke manifold. I have a 7.6 cam and a jetex exhaust. I have stiffer v6 valve springs and lightweight cam followers too.
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