The MGB GT http://www.slowcarfast.com/MG Stuffing a big V8 into a poor little MGB. en-us Copyright 2017 Keith Tanner. All Rights Reserved. keith@miata.net (Keith Tanner) keith@miata.net (Keith Tanner) Wed, 28 Jun 2017 01:10:12 -0600 Wed, 28 Jun 2017 01:10:12 -0600 Keith's RSS generator http://blogs.law.harvard.edu/tech/rss 60 The MGB GT http://www.slowcarfast.com/MG/images_sml/RSS.jpg http://www.slowcarfast.com/MG 88 88 The MG's seen some action. http://www.slowcarfast.com/MG/diary.php?UID=648 http://www.slowcarfast.com/MG/diary.php?UID=648 First, I took it to the track again. I finally got the chance to see how it handled at the limit without the big fireballs. The answer? Not that well, really. The car was oversteering badly, feeling like an arrow flying backwards. On the sweeper, it was actively trying to kill me constantly. The steering still had the wobble in it I didn't want. I tried adjusting the rear suspension pickup points (based on something I came across in Mark Donohue's "Unfair Advantage", of all things) and it helped a bit. But it was still twitchy and difficult to even drive on the interstate without the car exhibiting roll steer.
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Sun, 05 Jan 2014 18:53:04 -0700 The MGB GT
Another steering tweak. http://www.slowcarfast.com/MG/diary.php?UID=647 http://www.slowcarfast.com/MG/diary.php?UID=647 The steering feels overassisted - it's too light for my taste. I have a few things to learn about power steering systems in terms of the results of different pressure versus different flow, but the RX7 crowd seem to think that trimming the relief spring should drop the pressure a bit. Others claim that the only real solution is a Turn One pump for $240.
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Tue, 12 Jun 2012 18:00:54 -0600 The MGB GT
Time to work on steering. http://www.slowcarfast.com/MG/diary.php?UID=646 http://www.slowcarfast.com/MG/diary.php?UID=646 I've been trying to track down some free play in the steering wheel. It's definitely not the tight, responsive steering it should be. It appeared to be in the rack itself. First I tried adjusting the rack to see if that would help, but no. So today was spent pulling out the old rack and slotting in a replacement. It was a bit of a challenge, one of the bolts was almost completely inaccessible with the engine in place. One custom-length socket later and it succumbed!
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Tue, 12 Jun 2012 17:54:41 -0600 The MGB GT
When I repainted the dash a while back, I simply covered up a crack with black tape and sprayed over it. http://www.slowcarfast.com/MG/diary.php?UID=645 http://www.slowcarfast.com/MG/diary.php?UID=645 This was intended to be a temporary thing, with a future plan of refinishing the complete dash. But then the 1969 parts car showed up with a plastic dash cap - and you know what? It looked pretty good. I think I saw one in place when I was at the Mitty as well. So I decided to take the easy route.
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Tue, 12 Jun 2012 17:52:25 -0600 The MGB GT
Insulation time! http://www.slowcarfast.com/MG/diary.php?UID=644 http://www.slowcarfast.com/MG/diary.php?UID=644 The exhaust has to run just below the main fuel feed at one point. I had it insulated with the foil-backed fiberglass insulation at right, but figured it wouldn't hurt to improve it. The rubberized...umm... stuff is the same sort that's used for protecting wiring for oxygen sensors, so it's easily able to deal with high heat. It's actually from a company that also made parts for the space shuttle, only that version had more Kevlar and looked cooler. Anyhow, it was a fairly short job pop the fuel line off the filter/regulator and slide the black insulation over top. Let's here it for quick-release fuel fittings!
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Wed, 06 Jun 2012 21:01:11 -0600 The MGB GT
So, how does the new fuel tank work? http://www.slowcarfast.com/MG/diary.php?UID=643 http://www.slowcarfast.com/MG/diary.php?UID=643 So far, so good. I used the car for some errands today (which somehow required sudden bursts of acceleration for no apparent reason) and it worked fine. It was hot, too - somewhere around 95F and the car managed to keep its cool.
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Tue, 05 Jun 2012 17:40:15 -0600 The MGB GT
Hang on a second, the tank is supposed to be in the car. http://www.slowcarfast.com/MG/diary.php?UID=642 http://www.slowcarfast.com/MG/diary.php?UID=642 The car was running just fine...until I had it backed out of the garage and it died. No fuel pressure. I jacked the car up there and started running diagnostics. Of course, the first thing you suspect is the thing you just did. But because it was such a pain to weld the tank back together, I started looking elsewhere.
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Sun, 03 Jun 2012 19:39:36 -0600 The MGB GT
With the tank back in, it's time to sort out the spitting fuel problem. http://www.slowcarfast.com/MG/diary.php?UID=641 http://www.slowcarfast.com/MG/diary.php?UID=641 That's what led to the fireball at the track. I probably should have put some baffling inside the filler neck to avoid any splashes, but instead I decided to borrow yet another Miata part.
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Tue, 22 May 2012 23:41:53 -0600 The MGB GT
To avoid the problem of the baffle segregating the tank into have and have not sections, I drilled a few holes. http://www.slowcarfast.com/MG/diary.php?UID=640 http://www.slowcarfast.com/MG/diary.php?UID=640 They won't allow rapid flow of fuel from one side to the other, but it will be enough to let me use the full tank capacity. Between this and removing the giant sealed off canister, I've probably doubled my tank capacity.
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Tue, 22 May 2012 23:37:33 -0600 The MGB GT
The lines have been shaped. http://www.slowcarfast.com/MG/diary.php?UID=639 http://www.slowcarfast.com/MG/diary.php?UID=639 The big canister is now a big round baffle. There are some angled flaps on the bottom to make it easy for fuel to run in but a bit more challenging for it to run out. The return line also dumps into the canister to ensure it's got fuel in it. The lines take two different routes to avoid the float for the fuel gauge.
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Tue, 22 May 2012 23:33:41 -0600 The MGB GT
Time for some re-engineering. http://www.slowcarfast.com/MG/diary.php?UID=638 http://www.slowcarfast.com/MG/diary.php?UID=638 The big canister has been repurposed - more on that later. I decided to move both the fuel pickup and return to the right front corner of the tank for better exhaust clearance. I used 3/8" and 5/16" brake line to form the lines, and kept the fuel pickup in the original location. I put a Miata "sock" on the pickup to replace the small MG one. Here I'm just starting to shape the pickup line.
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Tue, 22 May 2012 23:30:59 -0600 The MGB GT
Here's a view on how the giant canister was placed in the tank. http://www.slowcarfast.com/MG/diary.php?UID=637 http://www.slowcarfast.com/MG/diary.php?UID=637 You can see a couple of dents in this shot as well as the one baffle that was in place. It's to keep fuel from sloshing around and upsetting the fuel gauge, I assume.
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Tue, 22 May 2012 23:28:06 -0600 The MGB GT
There was a big surprise waiting inside. http://www.slowcarfast.com/MG/diary.php?UID=636 http://www.slowcarfast.com/MG/diary.php?UID=636 A BIG surprise. This giant canister. That's the top of the tank, upside down. The line running under the tank is the one that was originally attached to the charcoal canister. There's an itsy bitsy hole in the top of this canister, probably to prevent heat expansion from forcing fuel into the canister.
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Tue, 22 May 2012 23:24:58 -0600 The MGB GT
The car has been sitting for quite a while. http://www.slowcarfast.com/MG/diary.php?UID=635 http://www.slowcarfast.com/MG/diary.php?UID=635 There have been a few reasons, but the biggest ones center around the fuel tank. Janel wasn't a big fan of the whole fireball escapade on the track for some reason. The fact that the car also stranded her on the side of the road on the way home didn't help.
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Tue, 22 May 2012 23:20:52 -0600 The MGB GT
MG for sale! http://www.slowcarfast.com/MG/diary.php?UID=634 http://www.slowcarfast.com/MG/diary.php?UID=634 No no no, not the V8 one. The parts car. I'm thinking I'm probably done with it, and it needs to move out to clear some room in the driveway.
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Sat, 17 Dec 2011 19:08:57 -0700 The MGB GT
It wasn't all fireballs and oversteer yesterday. http://www.slowcarfast.com/MG/diary.php?UID=633 http://www.slowcarfast.com/MG/diary.php?UID=633 Janel spent most of the day running around town in the little car, and seems to have quite enjoyed it. The car still has a tendency to pop out of reverse (and will continue to do so until I pull the transmission to fix it) so she planned her stops as pull-through only.
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Sun, 24 Jul 2011 10:47:36 -0600 The MGB GT
Track day test! http://www.slowcarfast.com/MG/diary.php?UID=632 http://www.slowcarfast.com/MG/diary.php?UID=632 I was at the track testing the Targa Miata, and Janel stopped by with the MG. It garnered quite a bit of attention - all you have to do is park this car with the hood up and it will cause some double-takes.
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Sun, 24 Jul 2011 10:36:16 -0600 The MGB GT
I spent most of the weekend on other things, but I did crawl under the MG to take a shot at solving the vibration. http://www.slowcarfast.com/MG/diary.php?UID=631 http://www.slowcarfast.com/MG/diary.php?UID=631 (more)]]> Mon, 18 Jul 2011 14:51:50 -0600 The MGB GT So how did the new spring setup work? http://www.slowcarfast.com/MG/diary.php?UID=630 http://www.slowcarfast.com/MG/diary.php?UID=630 Beautifully. I'm not sure what's changed from the first time I had this combo on the car, but the car has a beautiful fluidity over bumps and a well-controlled ride. It's as if I've discovered some secret suppleness setup. It's not perfect yet - the car is a bit disconcerting on turn-in. It's almost as if the rear takes a moment to catch up to the front. I think part of the problem is very responsive steering and too much power assist. If the steering had a bit more heft to it, it would be more in line with the way the rest of the car works. This is something that's been on my to-do list for a while. Soon!
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Wed, 13 Jul 2011 22:50:10 -0600 The MGB GT
I found something else while I was under the car: my vibration. http://www.slowcarfast.com/MG/diary.php?UID=629 http://www.slowcarfast.com/MG/diary.php?UID=629 (more)]]> Wed, 13 Jul 2011 22:46:44 -0600 The MGB GT