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Engine Specific Info and Questions => IDI Engine => Topic started by: trav1856 on April 17, 2011, 07:11:17 pm
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So as I've been pulling parts of the Cabriolet, I discovered that the idiot I bought it off of, took all the bolts out of the motor mounts, except for the rear one. (The one the transmission bolts to), so I'd have had a fun time getting that out without making the engine hit the floor. I was removing the strut and control arm from the driver's side. (basically I'm completely dismantling the thing, so see if there is anything that would prevent a rebuild, in the event I decide to restore it, though it's pretty much gutted on the interior, so I may just use what I can and sell off the rest).
Starter looks new. alternator looks like the original. A/C compressor won't fit so that's going in the sell pile (diesel one on mine is rotary)...and I think it may be locked up anyway so it'll have to be rebuilt, then again it could just be the clutch locked up. Distributor is good, going into the sell pile. (along with the block and head).
I'm considering using the intake on my diesel and using a remote air filter...perhaps a 3" setup (maybe 4"?) to give it a better breathe on the intake, and then drilling out the donut on the exhaust to 3" and running a 3" exhaust. Between that and the governor mod, without running a turbo, what do you think I can get HP wise? (R.O.R. feel free to chime in)
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removing backpressure from an NA diesel is not such a good idea..
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I was under the impression that's what you were supposed to do to a point...or do you just increase the exhaust size if you're running turbo? I've read a lot of conflicting info.
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removing backpressure from an NA diesel is not such a good idea..
Why? There is absolutely no need for back pressure on a diesel. I am running my N/A through a 2" straight pipe, with a Cherry Bomb glass-pack in the tunnel in front of the shifter. Sounds BEAST.
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A 2" system still creates backpressure. the op indicated he wanted to use 3". although your 2" might sound 'beast' that does not equate to power. a 3" exhaust will cost the OP power. Just because it is a diesel does not mean that EVERYTHING is opposite ;)
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3" is a bit much for a NA.. However the 2" will equate to some power gain over the stock straws they used.. Much over 2" is just gonna make more noise and nothing else, unless you're planning on some crazy mufflers in the mix...
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A 2" system still creates backpressure. the op indicated he wanted to use 3". although your 2" might sound 'beast' that does not equate to power. a 3" exhaust will cost the OP power. Just because it is a diesel does not mean that EVERYTHING is opposite ;)
Yes a 2" straight system will still have some back-pressure. Compared to the 1.5" system with a resonator and a muffler however it is pretty much none. 3" might be much, I wasn't appraising the 3".. merely the straight pipe idea. I am not just making an assumption here or a wildass guess that because its diesel it is a complete 180 different than gas, therefore requiring no back pressure.. There is virtually no valve overlap. If one is open, the other is closed. They are fully open at BTDC, and fully closed at TDC.. resulting in absolutely no need for back pressure.
3" is a bit much for a NA.. However the 2" will equate to some power gain over the stock straws they used.. Much over 2" is just gonna make more noise and nothing else, unless you're planning on some crazy mufflers in the mix...
Yes i wouldn't say 3" would hurt anything more than your wallet or your ears.
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Thanks for the input....
Now about the gasser intake...good idea? bad idea?
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Ok, so lets assume that an NA diesel doesnt need any backpressure at all, why is the exhaust smaller on an NA diesel than its gas counterpart? One would think that a design change in manufacturing would be more expensive than using both exhaust systems for gas and diesel alike...
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The smaller exhaust was a noise reduction measure.. We Americans were skerd of them big bad new fangled diesels back then..
Trav, as far as the gasser intake goes there really isn't much gain on an NA other than the ability to plumb a cone filter wherever you'd like.. Take a close look at a MK1 NA intake, not gonna get much more flow than one of those....
For a TD however, they are an upgrade from the stock TD manifold..
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The smaller exhaust was a noise reduction measure.. We Americans were skerd of them big bad new fangled diesels back then..
Ahh, interesting! Damn 'Murricans ;)
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The smaller exhaust was a noise reduction measure.. We Americans were skerd of them big bad new fangled diesels back then..
Trav, as far as the gasser intake goes there really isn't much gain on an NA other than the ability to plumb a cone filter wherever you'd like.. Take a close look at a MK1 NA intake, not gonna get much more flow than one of those....
For a TD however, they are an upgrade from the stock TD manifold..
if you add 3" or larger piping to your air box, instead of the 1.5" snorkel its got, that will help more than a different intake manifold..
usually the only ones running the gasser intakes, are us guys with low mounted turbos.. i just didnt think that the stock TD manifold was that good of a design. sure, it works, but it has right angle ports, and the outside cylinders dont get much air flow..
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Damn 'Murricans indeed Vanagon.. I had convinced a customer to put 2" pipe on his Jetta Coupe.. We actually used a decent muffler and the damned thing was still rather loud, but darn did that bugger run and sound good... It was too loud for his tastes unfortunately.. The addition of a resonator made it tolerable but at a noticeable loss of power..
if you add 3" or larger piping to your air box, instead of the 1.5" snorkel its got, that will help more than a different intake manifold..
Right on!!! Plumb it right up beside the radiator beside the grill and you'll have faux ram air! However you'll want to not do that in very cold temps...
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Damn 'Murricans indeed Vanagon.. I had convinced a customer to put 2" pipe on his Jetta Coupe.. We actually used a decent muffler and the damned thing was still rather loud, but darn did that bugger run and sound good... It was too loud for his tastes unfortunately.. The addition of a resonator made it tolerable but at a noticeable loss of power..
if you add 3" or larger piping to your air box, instead of the 1.5" snorkel its got, that will help more than a different intake manifold..
Right on!!! Plumb it right up beside the radiator beside the grill and you'll have faux ram air! However you'll want to not do that in very cold temps...
cold temps and moist air may make some condensation on your air filter, and that wouldnt be good. frozen air filters do not flow very well..
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cold temps and moist air may make some condensation on your air filter, and that wouldnt be good. frozen air filters do not flow very well..
I never even gave that a thought.. :o My experience with the faux ram air was a 3 day wait for heat last winter...
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Another point worth noting on the smaller exhausts on the diesels was also because they were never really meant to be rev'd more than 3500 from factory.. No need to have such a big intake or exhaust to move so much air if it didn't need too..
However I think a 3" exhaust and 3" intake tubing, as well as the Governor Mod in my signature.. Will liven this little beast up to intense proportions!
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a 3" exhaust
Leave some money in the budget for hearing aides..... ;D
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Use the earplugs those competition sound guys use ;). Got it all figured out.
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Another point worth noting on the smaller exhausts on the diesels was also because they were never really meant to be rev'd more than 3500 from factory.. No need to have such a big intake or exhaust to move so much air if it didn't need too..
However I think a 3" exhaust and 3" intake tubing, as well as the Governor Mod in my signature.. Will liven this little beast up to intense proportions!
theres no reason to run a 3" system if the turbo motors dont even benefit from a full 3" system, over a full 2.5" system..
i wouldnt think you would need more than a 2" system on a n/a.. theres just no reason to run an over kill exhaust system. 3" is hard to fit under the car anyways.. alot harder to fit than a 2.5" system..
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Damn 'Murricans indeed Vanagon.. I had convinced a customer to put 2" pipe on his Jetta Coupe.. We actually used a decent muffler and the damned thing was still rather loud, but darn did that bugger run and sound good... It was too loud for his tastes unfortunately.. The addition of a resonator made it tolerable but at a noticeable loss of power..
if you add 3" or larger piping to your air box, instead of the 1.5" snorkel its got, that will help more than a different intake manifold..
Right on!!! Plumb it right up beside the radiator beside the grill and you'll have faux ram air! However you'll want to not do that in very cold temps...
so maybe a switchable air intake feed? Pull a cable....bam...no air from the psuedo-ram. Instead it gets it from inside the engine compartment. In fact I think you'd be able to use a cable-activated gasser exhaust dump (something like this: http://img216.exs.cx/img216/2440/dsc018211ym.jpg)
(http://img216.exs.cx/img216/2440/dsc018211ym.jpg)
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Trav! I dig the hell out of that idea. Pull it right near the manifolds, for a little warmer air when its super duper cold out, and blam cold air when you want it ;)
I agree the 3" would be overkill. 2.25 is more than enough.
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I'm please you approve, I thought it would be a good idea, but wasn't entirely sure.
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That would work pretty slick.. If you frequent bone yards check out some air cleaner snorkels on some older stuff.. They basically did the same thing back in the day except they used hot air off the exhaust to aid in warm up.. Usually they worked off vacuum, but some used a bimetal spring.. Might be able to snag one cheap..
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That would work pretty slick.. If you frequent bone yards check out some air cleaner snorkels on some older stuff.. They basically did the same thing back in the day except they used hot air off the exhaust to aid in warm up.. Usually they worked off vacuum, but some used a bimetal spring.. Might be able to snag one cheap..
open up the air box on a mk2 VW. all of them had the flap for if it was too cold..
they sucked air off the exhaust manifold when it was super cold outside. then when the air warmed up enough, the box would switch from hot manifold air, to cool fender well air..
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Speaking of Hot and Cold.
I've got a knob on the right hand side of my steering wheel that looks like a choke cable (but we all know it's not), is this the cold start cable? (and what does it do?)..advances the timing or something?
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Speaking of Hot and Cold.
I've got a knob on the right hand side of my steering wheel that looks like a choke cable (but we all know it's not), is this the cold start cable? (and what does it do?)..advances the timing or something?
yes, cold start advance..
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Speaking of Hot and Cold.
I've got a knob on the right hand side of my steering wheel that looks like a choke cable (but we all know it's not), is this the cold start cable? (and what does it do?)..advances the timing or something?
yes, cold start advance..
I love you, man
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the ", man" in the i love you sentence is what takes that phrase from being awkward.. to socially acceptable. ;)
Pulling the cold start advance lever mechanically advances the piston inside the pump by about 0.05mm (i think) if you were to use a dial indicator and pull the lever out. Generally with a stock setting of around 0.90mm the advance to 0.95mm really helps a ton for cold starting and warm-up. However with todays advanced power settings of 1.00mm and up, the coldstart lever is rendered pretty much useless.. unless you have an mk2 pump which should also have an idle increase on it as well when you pull the lever :)
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So if I do the governor mod and set it to 1.0mm, I wouldn't need the advance? Gotcha. Now the other question is, this plunger thing, I keep hearing people say put a bigger plunger and a 1.9 cam plate. Necessary?
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Not without a turbo......
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I'm running a 2.5" exhaust NA with a homemade muffler and a thrush welded muffler and it's far to loud for my liking. The drone takes forever to leave my head.......
2.5" straight with a vnt-15 sounded nice and wasn't at all to loud.
If I was redoing my exhaust for NA I wouldn't go bigger than 2".
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I'm running a 2.5" exhaust NA with a homemade muffler and a thrush welded muffler and it's far to loud for my liking. The drone takes forever to leave my head.......
2.5" straight with a vnt-15 sounded nice and wasn't at all to loud.
If I was redoing my exhaust for NA I wouldn't go bigger than 2".
x2
exactly what he said..