johny
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Everything posted by johny
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For a dog I think its got to be a GT6 as the 'boot' area would suit a small to medium sized one. I certainly used to get a mate in there many moons ago, laying on the flat area, but even I wouldnt have put him in the boot of a Spitfire😲
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If I remember right your hesitancy was produced at higher speeds whereas knocking/pinking tends to be worst when accelerating at low revs in a high gear. I think its a really noticeable sound but some people seem to find it hard to diagnose perhaps mistaking it for something mechanical.....
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Result! Cant explain exactly why too advanced did that except the timing is set up so that the explosion starts before TDC and allows enough time for the combustion to produce the maximum pressure just at the right moment ie. after TDC. If you now have pinking (knocking) the mixture is igniting in another area of the combustion chamber because its too explosive and being set off by the pressure wave from the initial spark induced ignition. The best solution is to decrease the ignitability of the fuel by increasing its octane or a poorer alternative is to reduce the advance of the igntion timing....
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+1 for VSPe which I found reduced run on and pinking although now that I have the engine running cooler both have improved a lot just on standard 95 and I save the additive for longer, higher speed runs.
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Hi Craig, great choice of car but you do need to be fairly nimble getting in and out of them😂 Unfortunately the price of these, especially with the desirable overdrive, has shot up just recently so be prepared to pay a considerable sum if you want a restored one. They are now getting close to some TR6 prices which seem to have fallen back possibly due to an influx of ex USA models. Let us know what your plan is as you'll certainly get loads of tips and info on here....
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Spitfire MkIV - rear end knocking mystery
johny replied to cwillst's topic in Drivetrain & Rear Axle
Maybe theres a bit more movement than on my diff but the noise is certainly very similar. I too had oil leaking from the front seal but cleaned out the vent jiggle pin and luckily its now not longer worth worrying about👍 -
I know its a pain but if it hasnt been done recently I would also recommend a compression and valve tappets adjustment check so that they can be discounted.....
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I see in the original post the timing is 'set 2 - 3 degrees more advanced than the white line' and I wonder why this is? Presumibly the white line was marked by the previous owner to indicate the standard timing position to use a strobe and if correct I cant see that it should ever be set more advanced than that. Normally you set the timing to this point and then retard it progressively to get any knocking to an acceptable level....
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The gear levers seem to be hard to come by but do come up on ebay from time to time but obviously arent cheap. Why not try some experimenting with the clutch before replacing everything. You can also check under the master cylinder rubber covers for a leak and then carefully watch the level in the reservoir while an assistant presses the pedal (if it increases at all then the mc has a problem).....
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yes keep on knocking them down - remember its all part of the fun and one day will give you stories to bore the grandkids with🤣
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only one pump for all Heralds at 16 pounds from Paddock or repair kit 8.75. VAT and postage on top....
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A clutch thats not disengaging fully is certainly something which could produce symptoms like yours although I would expect it to give problems in all gears especially 1st when stationary. Theyre not adjustable but obviously you should check the clutch reservoir fluid level if you havent already done that and also try pumping the clutch pedal a few times quickly before selecting or disengaging a gear. Its possible you have a seal in the system thats not doing its job properly (getting worse with use/temperature) and by pumping you can temporarily get sufficient pressure for the clutch to separate enough to allow the gear change. Let us know if this works and if not we'll have a think as to what else it could be.....
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theres two in each mechanical pump, both of which have to seal well and they come in the repair kits but are a bit fiddly to change. You can test them individually by removing the pump filter cover then blowing back through the outlet pipe and next sucking on the inlet. In neither case should air flow but I bet in yours as in mine it will so the easiest option for me was a replacement pump which has worked perfectly although Ive seen recent posts complaining that some produce too much pressure.....
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That sounds perfectly normal although the drain back on the engine side should only reach the same point in the fuel line as the level in the tank. It happens because the carb float chamber has a vent to atmosphere through the air filter which allows air out when filling the chamber plus overflow if the float valve doesnt close properly. I dont think a tap in the line is necessary as if the non return valves in the fuel pump are good it should quickly refill the carbs but its true a higher level in the tank will help....
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believe the flinger is very easy to move and in some cases has opened up so much it wont stay put. If youve got everything else right just tap it along evenly up to the housing....
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I think this thread a little while ago was about a very similar problem: 'Rear swing spring conversion dangerous due to camber?'
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Im no expert but I believe using a lowering block has some implications: suspension travel is reduced so theres greater risk of bottoming out rear wheel toe in and camber is increased which along with the lowering of the rear of the car reduces oversteer/increases understeer the thickest blocks (1"?) will require the use of longer fixing studs
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I think the strobe should light up at same timing mark on number 4 as on 1 then. If the dizzy shaft doesnt have much play I cant see anything else wrong with it would explain the erratic idle sparking (that doesnt discount the points, cap and leads etc) so dont think you should replace it or get electronic ignition yet. I would sort this issue out first before introducing more variables. Fuel mixture will of course cause poor running but the spark should still be pretty regular because the crank and flywheel have a lot of inertia that help to smooth out any misfires.
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I take it idles pretty roughly then! You could try the timing light on other spark leads especially the one that fires at the same point as number 1 to see if they are erratic as well....
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Ha mine was what appears to be the normal weld used to attach the rear bracket to my stainless system. It rusted through and luckily broke at slow speed so not too much damage done!
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Dolly 1850 single rail gearbox in to mk3 GT6
johny replied to Graham C's topic in Gearbox & Overdrive
Looks like the end of the saga is in sight but I dont think I'll be going down the same route anytime soon! Going back to the question of the tube I think you did the right thing sealing it as Im not sure the gearlever rod has o-rings as was suggested. It looks like it just runs through holes in the ends of the main casing with no form of sealing..... -
Really what you need is an oil testing service! You send them a sample and they can check its level of degradation and contamination including which metals are present to let you know what components are wearing. Complete peace of mind and it cant be that expensive, can it?
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Agree especially as our oils are usually subjected to much more contamination from fuel and combustion products than a modern engine and which no filter or oil, no matter how good they are, will protect against.
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yes apparently its the smoothness of the surface finishes that comes into it as well. Now that these are machined smoother compared with the old days surfaces can run closer together without the microscopic peaks coming into contact so clearances can be smaller and oil films thinner. Rougher surfaces have to be held further apart so a thicker oil film is needed and this is achieved by using a higher viscosity oil....
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GT6 diff/gearbox oil specs and recommended brand(s)
johny replied to richhl's topic in Drivetrain & Rear Axle
think its like engine oils (eg 20/50) as its got the viscosity of an 80 when cold and a 90 when hot rather than having the temperature/viscosity curve of a monograde.....
