yorkshire_spam Posted April 29, 2021 Share Posted April 29, 2021 (edited) So, back in 2015 the engine in the Spitfire was a bit "tired" so I decided to swap the spare in for the Boarder Raiders run as a test to see if it was up to the 10CR that year. It failed, valve springs shattered on day 2, dropping the valve into the top of the piston, which then drove the valve guide out of the head smashing the rocker arm on it's way out. 😞 A swift engine change, with assistance from Mik Davies saw us back on the road in time for the 10CR and the spare engine sat on the engine stand in the garage until October 2019 waiting for attention. I stripped the engine and the "dings" in the bore made me think that it was perhaps beyond saving, but after taking the block to my local trusted engineering company (William Browns of Halifax) we concluded that a +060 over-bore would save it.... Because I'd been paid my bonus at work in 2019 I had a bit of budget to spare, so I decided I'd rebuild to "vanity spec" not just a plain old rebuild. New rods, pistons and a fast-road cam from newmans (with new high spec followers as well) I matched the piston+rod+pin weights to within about 2 grams and had the head "sorted" by Peter Burgess to his "fast road" spec. I measured the combustion volume and had the head skimmed to bring the CR up to 10.2:1 Duplex vernier timing gear added, a rebuilt dizzy from H&H.... I got the engine in and running in April 2020 Since then I've added a 4:2:1 exhaust manifold and had the twin SU carb bodies rebushed and I've rebuilt the carbs and fitted them. Sadly due to "the situation" it's not done enough miles since then to even be considered run in. Hopefully back on the road in the next few weeks. Edited April 29, 2021 by yorkshire_spam Fix images 3 Quote Link to comment Share on other sites More sharing options...
Tim Hunt Posted April 29, 2021 Share Posted April 29, 2021 Very good work Sam and nice to see you back on the Forum. Tim Quote Link to comment Share on other sites More sharing options...
McJim Posted April 29, 2021 Share Posted April 29, 2021 Found this after watching Sam's video. Jim. 1 Quote Link to comment Share on other sites More sharing options...
yorkshire_spam Posted April 29, 2021 Author Share Posted April 29, 2021 The images on my post seem to have broken since I posted earlier - is it just me or are they broken for everyone? Quote Link to comment Share on other sites More sharing options...
yorkshire_spam Posted April 29, 2021 Author Share Posted April 29, 2021 Ignore that last post, they seem fine now. Quote Link to comment Share on other sites More sharing options...
RobPearce Posted April 29, 2021 Share Posted April 29, 2021 Still broken for me. It's probably a permissions issue because they're hosted on a google folder. It happens a lot. Quote Link to comment Share on other sites More sharing options...
Craig Posted April 29, 2021 Share Posted April 29, 2021 Hi Sam, The images aren't on our servers, they are on a Google server? https://lh3.googleusercontent.com/ ? Quote Link to comment Share on other sites More sharing options...
sparky_spit Posted April 30, 2021 Share Posted April 30, 2021 Hi Sam - with the +60 pistons fitted, did you get any interference issues between the piston crowns and the gasket fire-rings? Quote Link to comment Share on other sites More sharing options...
yorkshire_spam Posted April 30, 2021 Author Share Posted April 30, 2021 1 hour ago, sparky_spit said: Hi Sam - with the +60 pistons fitted, did you get any interference issues between the piston crowns and the gasket fire-rings? Nope, everything cleared nicely. I had trouble with the rods interfering with the oil pump though, had to take the die grinder to the pump casing to get clearance. Quote Link to comment Share on other sites More sharing options...
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