Chris Bracey Posted August 27, 2019 Report Share Posted August 27, 2019 Hi. What is the purpose of this feed and will it affect the reading of an oil pressure gauge if i add an additional t piece from the adapter? Do 1500 spitfire engines suffer oild suppliy problems to the tappets? Thanks Link to comment Share on other sites More sharing options...
Clive Posted August 28, 2019 Report Share Posted August 28, 2019 The external oil feed is ONLY required if you are using certain roller rockers, and then needs to be restricted down in size. All the engines can suffer with poor oiling, but that is down to either blockages in the rocker shaft or serious wear. In both cases the best solution is a ,(quality, if there are any) new shaft, or possibly a good strip/clean. But for the cost a new shaft is no bad thing. Link to comment Share on other sites More sharing options...
Pete Lewis Posted August 28, 2019 Report Share Posted August 28, 2019 Yes this was sold as a must have you do not want The normal supply is restricted and gives one squirt on each revolution of the camshaft, the external add on supplies far too much oil to the rockers and floods the head , gives too much oil down the valve guides and can make blue exhaust smoke JohnD labels it as the spawn of satan and we all agree This takes oil away from the mains and crankshaft , certainly not what you need on a 1500 the crank needs all it can get Pete Link to comment Share on other sites More sharing options...
JohnD Posted August 28, 2019 Report Share Posted August 28, 2019 Glad to see that we are all singing to the same hymn sheet, brothers & sisters! Allelliuia! I'm John and I used an external oil feed! But I saw the light! (Through my burnt-out, worn-away main bearings, actually) And I'm bringing you the Good News, children! YOU DON'T NEED IT!!!!! Praise the ...... [ From the Editor. JohnD is unwell, but the straight jacket looks good on him] 1 2 Link to comment Share on other sites More sharing options...
Chris Bracey Posted August 28, 2019 Author Report Share Posted August 28, 2019 Now this might seem a daft question. Would its presence cause an oil presuure gauge to read low if it is not removed. Was it an after market product or did triumph fit it? Link to comment Share on other sites More sharing options...
JohnD Posted August 28, 2019 Report Share Posted August 28, 2019 I'm back. Ah, that feels better, the pills are taking effect already. A method of setting the size of the restrictor on the external lne, if you must have one, is to note the oil pressure (warmed up, etc) without the line, and then with, with a restrictor. If the line causes ANY drop, then fit a smaller restrictor. So YES, your line is shuntiong VAST quantitoes of oil up into the cylinder head AWAY form where it is really needed, the main and big end bearings. Take it off. TAKE IT OFF!!! TAKE IT OFF!!! John (NURSE! The screens! It's coming back! More pills!) Link to comment Share on other sites More sharing options...
Clive Posted August 28, 2019 Report Share Posted August 28, 2019 1 hour ago, Chris Bracey said: Now this might seem a daft question. Would its presence cause an oil presuure gauge to read low if it is not removed. Was it an after market product or did triumph fit it? Yes, it could cause a marginal pressure drop, but also reduce flow to the crank. Plus as others have said, flood the head with oil causing smoking etc. (I know of a fresh, no expense spared high performance engine that the builder fitted with a external feed. The owner gave me a call as it smoked badly when running, but all appeared well. I asked about roller rockers and external oil feed. No rollers, but there was an external feed. And lots of oil around the valvegear. I suggested he checked the normal oilway hadn't been blanked off, and if that was still operational, remove the external feed. That stopped all the smoking, and we a lovely engine. About 120 reliable bhp.) Link to comment Share on other sites More sharing options...
Steve P Posted August 28, 2019 Report Share Posted August 28, 2019 Similar story to Clives as above,but with a different result,the builder fitted a feed to a no expense spared 1500,it flooded the cover,even with a 1mm restriction,so much so that the oil catch tank filled with oil through the breather.They are blaming that on blow by caused by incorrect bedding in.Mine grenaded after 480 miles.:( It has to come apart again to check pistons,rings etc. as a minimum. S Link to comment Share on other sites More sharing options...
Chris Bracey Posted August 28, 2019 Author Report Share Posted August 28, 2019 Hi last two questions. Was this an aftermarket fitting and how would i know if there are rollers fitted. Looks bog std to me ! Link to comment Share on other sites More sharing options...
Pete Lewis Posted August 28, 2019 Report Share Posted August 28, 2019 generic std rocker roller rockers the external feed is not a triumph design its made for the myth brigade as after market Pete Link to comment Share on other sites More sharing options...
Chris Bracey Posted August 28, 2019 Author Report Share Posted August 28, 2019 Oh thank you very clear. Glad you all said what you did when i bought the car new i didnt remember it being there. Link to comment Share on other sites More sharing options...
Pete Lewis Posted August 29, 2019 Report Share Posted August 29, 2019 Think a quick removal is about to happen its just a short 5/16"unf set screw with a copper washer to blank the head port Removd the tee from the block and refit the low pressure switch direct to the block Pete Link to comment Share on other sites More sharing options...
Mjit Posted August 29, 2019 Report Share Posted August 29, 2019 Only possible issue is if the external feed was fitted with the standard oil feed up through the head blocked off, though that would put you in the 0.5% of engies fitted with external feeds group. I've been playing the same game with my big saloon and the advice on here (https://forum.tssc.org.uk/topic/5146-external-oil-feed/) was to run the engine with the rocker cover off, looking for a seep/slow dribble of oil slowly forming a pool on the head. If you get that with the external feed removed your internal feed is fine and the external one just over-oiling the rockers. If you don't then you might want to look further. Like clive I bought a shiny new performance engine from a Triumph specialist that came fitted with an external feed. Removing it: 1. REALLY cut down the engine's oil consumption. 2. Stopped the car behind me getting a spray of engine oil at start-up. 3. Has resulted in no long term rocker issues. My big saloon looks like it might have been done properly (if unnecessarily) - but the only way to check is to remove the head and I just can't be bothered Link to comment Share on other sites More sharing options...
Chris Bracey Posted August 31, 2019 Author Report Share Posted August 31, 2019 Hi. Apparantley the head is an unleaded conversion so there might be a risk the original oilway is blocked as the external feed was fitted at the same time. Where is the std oilway situated? I will do the test for oil pooling once the external feed is blocked off. Regds chris Link to comment Share on other sites More sharing options...
Pete Lewis Posted August 31, 2019 Report Share Posted August 31, 2019 It comes up from the rear cam journal and through a drilling in the head feeds up to the rear rocker pedestal and down the shaft to each rocker Link to comment Share on other sites More sharing options...
JohnD Posted September 1, 2019 Report Share Posted September 1, 2019 Chris, please tell us the result! Even gurus need validation (or not!) John Link to comment Share on other sites More sharing options...
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