driversdomainuk 8 Posted August 17, 2006 Hi As part of my bottom end rebuild for my 8v 1.9 I am planning on replacing: 1. Main & Big end bearings 2. Reground crank 3. Group A Oil Pump spring 4. Oil Pump 5. Pistons 6. Piston Rings 7. Liners 8. Conrods As I use it for hill climbing I want to ensure they are stand the abuse. As a result I am wanting to get Mi16 parts as opposed to normal 8v standard replacements where possible. It would be appreciated if anyone could indicate out of the above which I should go for in MI16 spec. I am currently thinking Mi16 liners as they are ribbed but what else will bolt on to an 8vso I know what to order in 8v spec and Mi16 spec Cheers Share this post Link to post Share on other sites
James_R 3 Posted August 17, 2006 IT also depends on how high you want to rev the engine Share this post Link to post Share on other sites
driversdomainuk 8 Posted August 17, 2006 IT also depends on how high you want to rev the engine Not too concerned about high revs - I am looking for reliability and good mid range power. Max RPM of an 8v is fine for me Share this post Link to post Share on other sites
petert 586 Posted August 17, 2006 If I had the parts available, I'd use Mi16 crank, rods, pistons and liners. All much better stuff, designed for continuous high speed operation. Share this post Link to post Share on other sites
driversdomainuk 8 Posted August 17, 2006 If I had the parts available, I'd use Mi16 crank, rods, pistons and liners. All much better stuff, designed for continuous high speed operation. Hi - So I take it Mi pistons, liners and rods all fit into a 8v..? Share this post Link to post Share on other sites
James_R 3 Posted August 18, 2006 Yes, but the pistons or head will need modifying as they will give you mega high CR Share this post Link to post Share on other sites
driversdomainuk 8 Posted August 18, 2006 Yes, but the pistons or head will need modifying as they will give you mega high CR Thats interesting as I ma going for a rally cam to work nicely with my carbs....I need a CR of 11.5 as recommended by QEP. Any ideas what Mi16 pistions will raise my CR to without having to skim the head..or would this approach be unsuitable...? thanks Share this post Link to post Share on other sites
James_R 3 Posted August 18, 2006 I'm afraid, you'll need to seach for the chamber volume of the 8v head, plus the gasket volume, the Mi pistons are flat top rather than the dished 8v type. maybe more suited ot using a XU10 head and the Mi pistons, Matt at QEP would be able to help better. Share this post Link to post Share on other sites
driversdomainuk 8 Posted August 18, 2006 I'm afraid, you'll need to seach for the chamber volume of the 8v head, plus the gasket volume, the Mi pistons are flat top rather than the dished 8v type. maybe more suited ot using a XU10 head and the Mi pistons, Matt at QEP would be able to help better. so by fitting a 16v head will increase its "standard" output to that of an original Mi16..? and will by fitting the 16v head give me as many tuning options as the original MI..? Share this post Link to post Share on other sites
SimonJ 2 Posted August 18, 2006 XU10 isn't 16v, it's an 8v from 306 XSi (and others) with bigger valves than XU5/XU9. Share this post Link to post Share on other sites
driversdomainuk 8 Posted August 18, 2006 (edited) XU10 isn't 16v, it's an 8v from 306 XSi (and others) with bigger valves than XU5/XU9. Ok I see I wonder how this would fair against a big valve head conversion Puma racing offer..? Edited August 18, 2006 by driversdomainuk Share this post Link to post Share on other sites
James_R 3 Posted August 18, 2006 If you try searching it, there's been lots covered on it before, it's got a much better flow capabitly than the std GTi head. plus the chamber is bigger so youc an then use flat topped pistons, but hav a search for the info. Share this post Link to post Share on other sites
smckeown 1 Posted August 18, 2006 yeah also look at the q-e-p website, he quotes the xu10 head gains on there also Share this post Link to post Share on other sites
petert 586 Posted August 18, 2006 Yes, but the pistons or head will need modifying as they will give you mega high CR You'll end up with approx. 11.25:1. I wouldn't call that mega high. Share this post Link to post Share on other sites
