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Twingo Technical & Detailing Information
Engine, Gearbox, Exhaust, Intake
RS133 cylinder head work
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<blockquote data-quote="singlespeed" data-source="post: 87751" data-attributes="member: 264"><p>The amount of extra work and therefore huge increase in costs for going up a mm in size mean it's not realy worth it. If there was room to easily go up a couple of mm in valve head size and open the ports to suit, it may be worthwhile. </p><p></p><p>Theres certainly room for improvement where the exhaust valve seats and guides have been machined into the casting. The limitting part is the complexity of the water jacket and knowing how much metal is there.</p><p></p><p>New exhaust valves will be going in as one has a slight bend. Still deciding about a full set from ebay for £50 :lol: or new ones from Karl, or maybe some one piece replacements <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite6" alt=":cool:" title="Cool :cool:" loading="lazy" data-shortname=":cool:" /> </p><p></p><p>The face will be machined to bring back the compression ratio and restore the sealing face after any combustion chamber work.</p><p>-----------------------------------</p><p>Headwork is on hold for now, as the head has gone on holiday to West Sussex and Belgium, care of Catcams UK <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite6" alt=":cool:" title="Cool :cool:" loading="lazy" data-shortname=":cool:" /></p></blockquote><p></p>
[QUOTE="singlespeed, post: 87751, member: 264"] The amount of extra work and therefore huge increase in costs for going up a mm in size mean it's not realy worth it. If there was room to easily go up a couple of mm in valve head size and open the ports to suit, it may be worthwhile. Theres certainly room for improvement where the exhaust valve seats and guides have been machined into the casting. The limitting part is the complexity of the water jacket and knowing how much metal is there. New exhaust valves will be going in as one has a slight bend. Still deciding about a full set from ebay for £50 :lol: or new ones from Karl, or maybe some one piece replacements 8-) The face will be machined to bring back the compression ratio and restore the sealing face after any combustion chamber work. ----------------------------------- Headwork is on hold for now, as the head has gone on holiday to West Sussex and Belgium, care of Catcams UK 8-) [/QUOTE]
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Twingo Technical & Detailing Information
Engine, Gearbox, Exhaust, Intake
RS133 cylinder head work
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