WIMPUS Posted October 7, 2019 Share Posted October 7, 2019 Hi, The Fox / Spit 1500 seems to have an very oily spark plug on number 3. Noticed the oil use going up to.. Now what could it be, worn valve guides or rings? At 290.000kms anything is possible i guess :/ (Engine has never been rebuild in 41 years) I first checked compression: 172 / 175 / 180 /175 A pic of the cleaned plug on cil 3 after 15/20km's drive. Quote Link to comment Share on other sites More sharing options...
nang Posted October 8, 2019 Share Posted October 8, 2019 I would guess rings as the compression has gone up. I've been known to be wrong before. 😃 Tony. Quote Link to comment Share on other sites More sharing options...
Velocita Rosso Posted October 8, 2019 Share Posted October 8, 2019 Wim, if your compression on all cylinders is around 170 psi , then its the valve guides I have similar issues and used quite a bit doing 2000 miles around Europe,Lingotto etc The bottom end was done a few years back so I know that it will be the guides On ignition start up I get a smoke puff and when I stop and then start up again shortly after, get the same smoke puff... as oil drains down the stems and into the pots This is where the for and against stem seals comes into question (only on inlet) Not a long job, head off and new inserts (and or new valves) Quote Link to comment Share on other sites More sharing options...
WIMPUS Posted October 8, 2019 Author Share Posted October 8, 2019 Mike, thanks for your reply ! After some more tests (leak-down etc) I would say the same. Everything seems very good, valves seems to seal very well after all these miles. So im now thinking of fitting a recon head with harden valves etc. Extra seals.. not sure, my friend has these fitted on his tr (but will ask the company). The old guides survived 180k ! So not to bad. Want another head so i can switch over and that the car isnt off the road for long as usual. Old head we can maybe fix at work for just the parts price... then i have more spares ! Quote Link to comment Share on other sites More sharing options...
WIMPUS Posted October 13, 2019 Author Share Posted October 13, 2019 Still looking for a recon head. Some company's ask a lot of money ! Now a friend of my uncle's (works a lot on old Beetles) said to check for glazing on the cylinder bores when the head is off. He could de-glaze them for me, but need a set of piston rings then to.. So i guess better everything at once. What do you all think ? 🤔 Quote Link to comment Share on other sites More sharing options...
Nick Jones Posted October 14, 2019 Share Posted October 14, 2019 How much oil are you using? Not normally possible to use very much oil with just valve guide wear as not very much oil goes to the top end of the engine (unless you have one of those external feed pipe kits - in which case all bets are off!). The other thing is that all your compression numbers are good, but you have one compression value higher than the others - #3..... which is the same one with the oily plug. So possibly you get the higher reading as there is enough oil getting into the cylinder to make the test a "wet" one. Might be worth adding oil (approx 1 desert-spoon full) to each cylinder and re-testing to see if all cylinders are now even? I'm pretty sure that enough oil to make it's own wet test can only be coming past the rings. Nick Quote Link to comment Share on other sites More sharing options...
WIMPUS Posted October 15, 2019 Author Share Posted October 15, 2019 Will try and do a wet test this evening. When I went to Rolduc (10cr finish) in september I used around 750ml of oil and did around 400km / 250 miles. Compression test of last year: Quoted from Nick Jones- How much oil are you using? Not normally possible to use very much oil with just valve guide wear as not very much oil goes to the top end of the engine (unless you have one of those external feed pipe kits - in which case all bets are off!). The other thing is that all your compression numbers are good, but you have one compression value higher than the others - #3..... which is the same one with the oily plug. So possibly you get the higher reading as there is enough oil getting into the cylinder to make the test a "wet" one. Might be worth adding oil (approx 1 desert-spoon full) to each cylinder and re-testing to see if all cylinders are now even? I'm pretty sure that enough oil to make it's own wet test can only be coming past the rings. Nick Quote Link to comment Share on other sites More sharing options...
Nick Jones Posted October 15, 2019 Share Posted October 15, 2019 750mls in 250 miles is alot! Even Audi don't claim that is normal! Nick Quote Link to comment Share on other sites More sharing options...
WIMPUS Posted October 15, 2019 Author Share Posted October 15, 2019 Quoted from Nick Jones- 750mls in 250 miles is alot! Even Audi don't claim that is normal! Nick I know it was just at the min mark on the dipstick. It was at max when i left. Quote Link to comment Share on other sites More sharing options...
Velocita Rosso Posted October 16, 2019 Share Posted October 16, 2019 Quoted from WIMPUS- Will try and do a wet test this evening. When I went to Rolduc (10cr finish) in september I used around 750ml of oil and did around 400km / 250 miles. I`d better stop moaning...I thought I had used a lot over the 2,200 mile last month. That`s double the amount I used (equating Wims ....2200 miles roughly 6,5 litres?).I used around 3.5 ltrs with giving it big licks around mountain passes and motorways. I was thinking at that time about dropping an ice cube,slice of lemon and an olive in the engine to accompany its bad drinking habit!.However Wim, your engine needs to visit Alcoholics Anonymous Quote Link to comment Share on other sites More sharing options...
Nick Jones Posted October 16, 2019 Share Posted October 16, 2019 Yours is pretty smokey from behind Mike..... Vitesse used 6 litres on the 2009 10CR (3,200 miles door to door). That was rings/bores. Wynns held it together until 2015. The first 1500 I had in my Herald would go through about 2.5 litres in 100 miles. That WAS smokey. Happened after treating it with Redex - never underestimate the usefulness of carbon deposits! Never investigated what the actual bore/ring issue was as it put a rod through the fuel pump when I was too slow to top it up...... Serious Wim, if you don't feel like pulling the engine apart just yet both the Wynns oil additive and the STP (Supercharge?), the ones that look like clear treacle, are really quite effective. Only used about 1.5 l on the 2011 10CR with the same engine. Nick Quote Link to comment Share on other sites More sharing options...
WIMPUS Posted October 17, 2019 Author Share Posted October 17, 2019 If its just needs a hone and new rings, we can do it at work. So will see whenever I get a replacement head and open it up. But 10cr time it was running lean i noticed and doing around 125/130kph for a long time. So could be that she didnt like that.. Now she seems stable and not to bad. Again.. with (now) 181.000miles everything can be expected.. Quote Link to comment Share on other sites More sharing options...
WIMPUS Posted October 27, 2019 Author Share Posted October 27, 2019 Today I've done a 310km / 190 mile trip (mostly motorway). I always have a top-up bottle in the boot (500ml Fanta bottle ). So used that bottle to see how much oil she used. Around 250 / 350ml she has used on the trip, she drove very well. Quote Link to comment Share on other sites More sharing options...
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