Members with 74 1.8, information needed for history of cars |
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Members with 74 1.8, information needed for history of cars |
wonkipop |
Nov 25 2021, 04:35 PM
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#1
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Advanced Member Group: Members Posts: 4,255 Joined: 6-May 20 From: north antarctica Member No.: 24,231 Region Association: NineFourteenerVille |
@StarBear & @wonkipop want to hear from members who own 1974 1.8s.
to assist with a topic in originality section of the website. Cars need to be reasonably original with L jet fuel injection system intact. If you have the time and can help us with some information it would be great. information. 1. Vin Date - month and year (no need to post vin numbers if you don't want to). thats the date on the driver door sticker. 2. Karmann plate #. or if you have already done the maths, the day and week of the year the car began production. 3. Image of engine bay emission sticker (lhs above the air cleaner - white with red letters). sticker should say whether it is an EC-A or an EC-B engine and whether it is california + EPA or only EPA. 4. image of engine tune up sticker. this is the small white sticker that is on LHS engine tin just below fan shroud. most of them are gone by now, but some engines still have them. 5. image of the throttle body. image of the distributor. we are looking at the vacuum hose set up between the distributor and the throttle body. ----- (IMG:style_emoticons/default/beerchug.gif) |
wonkipop |
Nov 28 2021, 03:33 PM
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#2
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Advanced Member Group: Members Posts: 4,255 Joined: 6-May 20 From: north antarctica Member No.: 24,231 Region Association: NineFourteenerVille |
@L-Jet914
i think i have figured out what the modification on yours does and why it might have been done. its someone's idea of how to cancel retard at standing idle. the basic idea would be the advance on the dist is being pulled at idle and counteracts the pull in opposite direction from retard. retard at idle was an emissions thing. it made combustion cooler for lower NOx emission. the plumbing in the modification possibly also changes the way the distributor comes off advance as you deaccelerate. someone has done it because they believe it makes it drive a bit sweeter is my guess. it probably does, you are driving it. the only way to know what its doing would be to drive another 914 with the original set up and compare alongside. stuff gets done to these cars. esp. these ones with the first real smog engines. EDIT actually i might have that the wrong way around, re-reading your original description. it seems they have gone for a different source of vacuum for the retard than the throttle body? and maybe took the factory cap off the advance port and put it on the retard port. and connected up advance when it was never connected. could be as simple as that. some-one familiar with the EC-B engines looked at this one and decided it was "wrong" so they made an EC-B style set up? |
L-Jet914 |
Nov 28 2021, 09:04 PM
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#3
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Member Group: Members Posts: 237 Joined: 24-October 12 From: Davis, CA Member No.: 15,080 Region Association: Northern California |
@L-Jet914 i think i have figured out what the modification on yours does and why it might have been done. its someone's idea of how to cancel retard at standing idle. the basic idea would be the advance on the dist is being pulled at idle and counteracts the pull in opposite direction from retard. retard at idle was an emissions thing. it made combustion cooler for lower NOx emission. the plumbing in the modification possibly also changes the way the distributor comes off advance as you deaccelerate. someone has done it because they believe it makes it drive a bit sweeter is my guess. it probably does, you are driving it. the only way to know what its doing would be to drive another 914 with the original set up and compare alongside. stuff gets done to these cars. esp. these ones with the first real smog engines. EDIT actually i might have that the wrong way around, re-reading your original description. it seems they have gone for a different source of vacuum for the retard than the throttle body? and maybe took the factory cap off the advance port and put it on the retard port. and connected up advance when it was never connected. could be as simple as that. some-one familiar with the EC-B engines looked at this one and decided it was "wrong" so they made an EC-B style set up? So what you're saying is that according to my tune up sticker, the vac advance side of the distributor was not supposed to be hooked up to the rear port facing the trunk of the throttle body (I've checked no vacuum until off idle at the rear port and manifold vacuum at the forward facing port)? I've only driven the car as you see pictured in the engine bay. I never drove the car prior to any engine work etc. I would love to see a EC-A setup L-Jet engine in bone stock configuration to see if I should remove the added vacuum t and route the retard side of the distributor to the manifold vacuum side of the throttle body. This thread is becoming more and more interesting as I've read through this. |
wonkipop |
Nov 29 2021, 02:42 AM
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#4
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Advanced Member Group: Members Posts: 4,255 Joined: 6-May 20 From: north antarctica Member No.: 24,231 Region Association: NineFourteenerVille |
@L-Jet914 i think i have figured out what the modification on yours does and why it might have been done. its someone's idea of how to cancel retard at standing idle. the basic idea would be the advance on the dist is being pulled at idle and counteracts the pull in opposite direction from retard. retard at idle was an emissions thing. it made combustion cooler for lower NOx emission. the plumbing in the modification possibly also changes the way the distributor comes off advance as you deaccelerate. someone has done it because they believe it makes it drive a bit sweeter is my guess. it probably does, you are driving it. the only way to know what its doing would be to drive another 914 with the original set up and compare alongside. stuff gets done to these cars. esp. these ones with the first real smog engines. EDIT actually i might have that the wrong way around, re-reading your original description. it seems they have gone for a different source of vacuum for the retard than the throttle body? and maybe took the factory cap off the advance port and put it on the retard port. and connected up advance when it was never connected. could be as simple as that. some-one familiar with the EC-B engines looked at this one and decided it was "wrong" so they made an EC-B style set up? So what you're saying is that according to my tune up sticker, the vac advance side of the distributor was not supposed to be hooked up to the rear port facing the trunk of the throttle body (I've checked no vacuum until off idle at the rear port and manifold vacuum at the forward facing port)? I've only driven the car as you see pictured in the engine bay. I never drove the car prior to any engine work etc. I would love to see a EC-A setup L-Jet engine in bone stock configuration to see if I should remove the added vacuum t and route the retard side of the distributor to the manifold vacuum side of the throttle body. This thread is becoming more and more interesting as I've read through this. yes, thats what i understand the tune up sticker to mean. our EC-B cars have a tune up sticker with both hoses shown and shown disconnected for timing at idle. its interesting when you look at something like a 2.0L they have i believe both hoses shown connected for the timing. it would in fact be easy to make yours an EC-B. you just plug the retard line directly into the retard port on the throttle body and take the cap off. thats what i think. but you have a form of manifold vacuum on the retard so why upset the apple cart. in a way you already have an EC-B set up. we would also love to see a bone stock EC-A setup. we are guessing what it is off the tune up sticker and description by @ClayPerrine . his description of how he believes L jet ought to be set up seems to accord with EC-A. --- the weird thing is the texas twin car probably came off the line the same day as mine. given its 30 numbers on in the VIN and mine is about the middle of a day's production. i forget the exact number. mine is around 45th car for the day. so the texas twin is probably right at the end of the day. so they are building EC-A and EC-B on the same day. and the funny thing is the dealers could easily have made an EC-B into an EC-A by just unplugging the advance and capping it and vise versa. as far as i can tell. maybe there is more to it. i don't know. |
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