bluelighttaxidriver Posted December 30, 2014 Report Share Posted December 30, 2014 Is this something that can be done by oneself..? Approaching the engine stripdown stage on my gt6 build. Fancy fitting a fast road cam, but would be better to sort the head too. Very much into the hands on approach, so would be very satisfying to tune it myself.... Link to comment Share on other sites More sharing options...
JohnD Posted December 30, 2014 Report Share Posted December 30, 2014 Useful, online engine building guide: http://www.totallytriumph.net/spitfire/engine_building.shtml John 1 Link to comment Share on other sites More sharing options...
GrahamB Posted December 31, 2014 Report Share Posted December 31, 2014 Yes you can do basic work yourself. Many years ago I worked on a Mk1 Fiesta. If I recall correctly, I clamped an electric drill in a "Wormate" bench and connected a flexible drive shaft. I used a small grindstone to match the ports to the manifolds and smooth out the major lumps left in the ports by the casting process. I then worked on the chambers to reduce the masking of the valves by the walls but very little metal could be removed because of the restriction imposed by the head gasket. Finally, I contoured around the valve seats and the valves before grinding in the valves. The head was re-assembled with a Weber DGV downdraught and a four branch exhaust. It certainly made a big difference to the performance but how much was due to the head work, I do not know. Given the oppertunity I would do the same again. Graham 1 Link to comment Share on other sites More sharing options...
bluelighttaxidriver Posted December 31, 2014 Author Report Share Posted December 31, 2014 That's useful to know, thanks. Will be finding someone to do the hardened valve seats for unleaded, then having a good look and think, as to whether I'm brave enough! Link to comment Share on other sites More sharing options...
JohnD Posted December 31, 2014 Report Share Posted December 31, 2014 Vizard can show you how to do it: http://www.scribd.com/doc/12986341/Tuning-Standard-Triumphs-Vizard Many decry his opinions and mods, but they seem to do me proud. And as he suggests. more than half the work that gives a benefit is in the inlet and exhaust ducts, niot just in the chambers. He says, and I agree, that a drill just won't spin a stone fast enough to cut cleanly and quickly. An air-driven die grinder will drive the tool at 14,000 plus rpm, which will also allow a burr to work. Burrs cost more than stones but last much longer and work much quicker. And if you do work on the chambers', it's essential thereafter to measure their volumes. They must be the same, within 0.5mls, and only then can you know the Compression Ratio, and how much to skim off the face to compensate for the metal you have taken out, or to increase the CR. JOhn 1 Link to comment Share on other sites More sharing options...
Peaks Posted January 1, 2015 Report Share Posted January 1, 2015 Extremely interesting & useful links: Thanks for posting John, Link to comment Share on other sites More sharing options...
GrahamB Posted January 1, 2015 Report Share Posted January 1, 2015 "He says, and I agree, that a drill just won't spin a stone fast enough to cut cleanly and quickly." I wondered why it took me so long. I thought that it was just my inexperience! Graham Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now