| Author |  Topic  | |
rannsachair
V4 Beginner
United Kingdom
92 Posts |  Posted - 25 Jan 2019 : 22:40:28  
| 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 |
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Britishfoxy
Starting Member
5 Posts | Posted - 30 Jan 2019 : 15:23:44
| 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
92 Posts | Posted - 30 Jan 2019 : 17:07:26
| 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
320 Posts | Posted - 05 Feb 2019 : 18:15:28
| | Chat to the guys at Burton. It is effectively 2/3 of a cologne V6 and they advised me. Can’t remember the size but they are big valves that they recommended. | |
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Derek
V4 Guru
United Kingdom
2191 Posts | Posted - 06 Feb 2019 : 12:06:11
| 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
3833 Posts | Posted - 06 Feb 2019 : 12:47:24
| 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
92 Posts | Posted - 06 Feb 2019 : 13:08:17
| 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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Krister K
Starting Member
Sweden
36 Posts | Posted - 21 Feb 2019 : 15:30:43
| I use 2.9 v6 valves. Same height as std valves.
Saab 96 v4 '75b | |
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| | Topic | |
Bigger Valves
