Iain T Posted February 5, 2020 Report Share Posted February 5, 2020 Another starter for 10, hands on buzzers......what is the standard thickness of a Vitesse Mk2 head? Yours in anticipation Iain Link to comment Share on other sites More sharing options...
Pete Lewis Posted February 5, 2020 Report Share Posted February 5, 2020 https://www.chriswitor.com/cw_technical/head_applications_chart.pdf 517610 517528 308351 3.300" Mk2 2000 to ME50000. Mk2 Vitesse/GT6 pete Link to comment Share on other sites More sharing options...
Iain T Posted February 5, 2020 Author Report Share Posted February 5, 2020 Thanks Pete, do I give the points and prizes to you or Chris Witor? Link to comment Share on other sites More sharing options...
Pete Lewis Posted February 5, 2020 Report Share Posted February 5, 2020 the only points ive got are on my railway ha ! and that needs some work like a classic hobbies go in fits and starts , in no particular order theres a lot of information that are all scurried away in all sorts of websites and downloads , trying to remember where you last saw it is the problem Pete Link to comment Share on other sites More sharing options...
Iain T Posted February 5, 2020 Author Report Share Posted February 5, 2020 Yes I'm at the point of writing notes to remember the ever increasing lists of things to do. Obviously the reason for asking the standard thickness is to try and ascertain if my head has been skimmed at some point in it's history (perhaps that's why I look like Frankenstein). Are there other telltale signs of skimmed heads? If it had hemispherical combustion chambers I could measure the diameter...but it doesn't. Iain Link to comment Share on other sites More sharing options...
JohnD Posted February 5, 2020 Report Share Posted February 5, 2020 Iain, If the head has been skimmed, work was probably done on the chambers. The first increases CR, the second reduces it. Height alone is complete guesswork. To KNOW what you have, and to calculate what you need to do, you must 'burette' the chambers. May I humbly suggest you read my article? It's on Sideways, at: http://sideways-technologies.co.uk/forums/index.php?/topic/7551-how-to-raise-the-compression-ratio-safely-and-effectively/&tab=comments#comment-99739 John Link to comment Share on other sites More sharing options...
Iain T Posted February 5, 2020 Author Report Share Posted February 5, 2020 Hi John, I've read your thread and there are sites which are plug and play to calculate. I have a burette on order but need to review the valve seat heights as this must effect the chamber volume. Iain Link to comment Share on other sites More sharing options...
JohnD Posted February 5, 2020 Report Share Posted February 5, 2020 Great, Iain! Glad to.advise if needed. J. Link to comment Share on other sites More sharing options...
Anglefire Posted February 6, 2020 Report Share Posted February 6, 2020 I got this from somewhere which makes calculating the CR much easier. CR head skim calculator_v3.xls Link to comment Share on other sites More sharing options...
Anglefire Posted February 6, 2020 Report Share Posted February 6, 2020 But will need some messing about with to work with a 6 cylinder and anything other than 1500 or 1300. Link to comment Share on other sites More sharing options...
Iain T Posted February 20, 2020 Author Report Share Posted February 20, 2020 Hi Mark, Sorry for tardy reply, thanks for the head skim spreadsheet. I put in the relevant data for a Mk2 and it seems to work and correlate with the Triumph Tuning Guide written in the days of old. I'm aiming for 10.0/10.5 : 1 comp ratio and my head seems to be nearly a stock 2.290" thick. Until CTM Performance have sorted out the up and down valve heights I will not be able to check the correct capacity of the chambers. I will then update the spreadsheet to give the skim depth. With the head off I can see the bores are in very good condition with the honing marks still visible. I will be taking the block out as phase 2 but I am hopeful I will get away with just a cam replacement, seals etc and balancing all the whirly bits. Plus strip and check the oil pump. I'll also be replacing the front sealing block with the TRGB steel version (threads are stripped on my ali block) as it constantly weeps oil. Cheers Iain 1 Link to comment Share on other sites More sharing options...
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