joel1994 0 Posted March 20, 2010 just wondering boys how do you bore a crossflow engine and how much is roughly? thanks joel Quote Share this post Link to post Share on other sites
Tinaman 0 Posted March 22, 2010 Hi, I,m not quite sure how this is done, but I think it involves boring out the block to the max and putting in pistons from a 1300cc engine. Make sure that you have a 711M block or you risk thin walling the block and cutting in to the water jacket. Some of the good engine overhaul shops will be able to tell you more. Quote Share this post Link to post Share on other sites
KG66Hitman 0 Posted March 22, 2010 (edited) I have found this book to be a good reference for what can and cannot be done and what should be done. Ignore the price, you should be able to find one cheaper, I'm sure there are plenty here who have a copy. http://www.amazon.com/Rebuilding-Tuning-Fo...e/dp/1850109389 Can't help you with engine work prices as I am in Australia and the Government here subsidises all Hot Rod modifications so they're free. :headscratch: :thumbdown: The 1300 piston theory is to increase compression due to the smaller volume combustion well in the piston top nothing to do with bore size. Edited March 22, 2010 by KG66Hitman Quote Share this post Link to post Share on other sites
MLI 8 Posted March 22, 2010 To take a 1600 xflow from 1600 to 1760 requires boring the cylinders from 81mm to 85mm, and there used to be some forged 85mm pistons available from Hepolite for this job (Hepolite Powermax 18954KR). There was a chap at the autojumble at the Mk1 Cortina Owners Club's National last year who had a set for sale, I think the price was around £250 for a complete set. Other than that, you can always buy a set of new forged 85mm Accralite pistons from Burton (at around £150 each...). See http://www.pumaracing.co.uk/cflow.htm for info on tuning the xflow. And have a look on eBay for the old "Tuning 4 cylinder Fords" book (much better than the other book mentioned above). Quote Share this post Link to post Share on other sites
G.O 19 Posted March 22, 2010 Make sure that you have a 711M block or you risk thin walling the block and cutting in to the water jacket. aye, good point - the MkII Cortina 681M blocks aren't really safe to bore out to 1760. You've really got to think of 1700 as a maximum, and even then that'll be right on the limits for most of them. Much better to find a 711M (or later) if you really want to go as far as 1760 Quote Share this post Link to post Share on other sites
lee b 1 Posted March 22, 2010 the ax blocks can go to 1800 but are very sought after and expensive. were they fitted to south african cars???? lee Quote Share this post Link to post Share on other sites
MLI 8 Posted March 23, 2010 the ax blocks can go to 1800 but are very sought after and expensive.were they fitted to south african cars???? lee Yes, see http://www.apexspeed.com/forums/printthread.php?t=13826 Quote Share this post Link to post Share on other sites
