Drivetrain My build thread.
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5th Gear
Joined: Apr 2011
Posts: 668
Likes: 4
Cleaned up my valve cover and put a couple stickers on it. They add Hp if you didn't know.
More importantly my head gasket came in from Cometic.
Now its the waiting game for all the little seals and gaskets to come in the mail. Then everything gets put back together.
More importantly my head gasket came in from Cometic.
Now its the waiting game for all the little seals and gaskets to come in the mail. Then everything gets put back together.
The stock head bolts are probably torque to yield, which means that they should be replaced with new stock bolts (since they have been stretched during initial engine assembly). Also make sure that the head and block are surfaced properly for the cometic gaskets, but I am sure that your machine shop understands that if they build drag motors. They have a reputation for being wonderful gaskets but need a very smooth surface to seal properly.
Nice job so far, you must have been pretty close to getting your ducati. You are buying top shelf parts and should have a powerful and durable MINI for years to come.
Have fun,
Mike
Nice job so far, you must have been pretty close to getting your ducati. You are buying top shelf parts and should have a powerful and durable MINI for years to come.
Have fun,
Mike
4th Gear
Joined: May 2006
Posts: 426
Likes: 20
I don't have a picture with the head off unortunately to confirm. I may simply be going senile and my recollection may be wrong. Can anyone shed any light?
Robbo
4th Gear
Joined: May 2006
Posts: 426
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The rebuild is looking great btw. Can't wait to see how it performs.
Did you decide to go with replacement BMW bearings for the crank, rods, and cams or was your builder able to find something better? I'm also kind of curious where you were able to find the tolerances for all that stuff so you know your engine was in spec
Typically that would be in an engine build manual but I don't think there is one out there for the N14 engine.
3rd Gear
Joined: Nov 2010
Posts: 222
Likes: 2
They are in the aftermarket scene since 2010...
here are my sets:
Vandervell racing is manufacturing them for Mahle Motorsport...
here is their catalog:
http://www.vandervell.co.uk/images/s...alogue1008.pdf
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5th Gear
Joined: Apr 2011
Posts: 668
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Nope I have the BMW ones. I couldn't find anything, but apparently I didn't look hard enough. Would you be worried about fitment with the aftermarket bearings? The stock ones come in different thicknesses to maintain a equal outer diameter for the rod to connect to. As for the tolerances for the pistons and rods. That information came with the pistons.
Last edited by MNIPWR; Jan 22, 2013 at 12:07 PM.
4th Gear
Joined: Jan 2013
Posts: 500
Likes: 1
From: Lake Worth, Florida
I am talking about the cat in the downpipe. I have already removed the secondary cat. The reason for relocating the one in the downpipe is due to fluid dynamics. Ill try to explain.
On a N/A car the exhaust gas exiting the combustion chamber cause a vacuum. Atmospheric pressure then pushes fresh air into the cylinders. The higher the velocity of the gasses leaving the combustion chamber the higher the velocity of the gasses going in. Now this works until velocity of the exciting gases exceeds the velocity of atmospheric pressure. Luckily we have turbos.
On a turbo car this matters when the car is cruising due to vacuum in the manifold. However since the exhaust has to be adequate while boosting the dynamics are incorrect for vacuum. This is part of the reason there is drone. Since turbo cars have pressure forcing air into the cylinders the exhaust gas velocity is not as important. The thing that is more important is that the exhaust flow is not impeded. When the flow is impeded it causes the turbo to work harder.
A cat works by having a materiel that is heated up from exhaust gasses and uses this heat to burn any excess fuel and any other crap it can. However it impedes exhaust flow. How much depends on the cat.
The reason for relocating is due to removing this flow impingement. By doing so you cause the exhaust gasses to have a higher flow then if the cat was in place, this make it easier for the turbos exhaust gasses to vacate the area and then the turbo doesn't work as hard pushing the fresh air in. It could also push it in faster since there are no gasses in the way.
Now removing it completely is ideal but that is smelly and illegal. Relocating it while probably still being somewhat illegal (not totally sure) it will be less noticeable, due to smell. When it is relocated downstream you give the gasses time to cool and expand. Pressure is inversely proportionate to volume. Since the volume between the turbo and the cat is greater than before the pressure is less. While the cat may be less efficient at cleaning the gasses due to it being cooler the turbo won't be working as hard and this can be tuned to give us more power.
That was long sorry, its not as simple as backpressure like people think.
On a N/A car the exhaust gas exiting the combustion chamber cause a vacuum. Atmospheric pressure then pushes fresh air into the cylinders. The higher the velocity of the gasses leaving the combustion chamber the higher the velocity of the gasses going in. Now this works until velocity of the exciting gases exceeds the velocity of atmospheric pressure. Luckily we have turbos.
On a turbo car this matters when the car is cruising due to vacuum in the manifold. However since the exhaust has to be adequate while boosting the dynamics are incorrect for vacuum. This is part of the reason there is drone. Since turbo cars have pressure forcing air into the cylinders the exhaust gas velocity is not as important. The thing that is more important is that the exhaust flow is not impeded. When the flow is impeded it causes the turbo to work harder.
A cat works by having a materiel that is heated up from exhaust gasses and uses this heat to burn any excess fuel and any other crap it can. However it impedes exhaust flow. How much depends on the cat.
The reason for relocating is due to removing this flow impingement. By doing so you cause the exhaust gasses to have a higher flow then if the cat was in place, this make it easier for the turbos exhaust gasses to vacate the area and then the turbo doesn't work as hard pushing the fresh air in. It could also push it in faster since there are no gasses in the way.
Now removing it completely is ideal but that is smelly and illegal. Relocating it while probably still being somewhat illegal (not totally sure) it will be less noticeable, due to smell. When it is relocated downstream you give the gasses time to cool and expand. Pressure is inversely proportionate to volume. Since the volume between the turbo and the cat is greater than before the pressure is less. While the cat may be less efficient at cleaning the gasses due to it being cooler the turbo won't be working as hard and this can be tuned to give us more power.
That was long sorry, its not as simple as backpressure like people think.
In all seriousness this thread is great. I had CP pistons/eagle rods with a dartan half sleeved block on my 420 hp civic hatch and still blew it up. Nothing is perfect so I wish you all the luck in the world. What are your main goals with this build? I'm assuming this is a weekend track car? I'm still only halfway through the thread :/ keep it up though. And I'm 31 years old not 40+ :P
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5th Gear
Joined: Apr 2011
Posts: 668
Likes: 4
Weekend warrior.. no it's my daily driver. My goal was to fix my daily driver. But I figured I might as wall spend a little more and make it awesome. If I had the extra cash I would of bought a new DD and then stroked this motor. Then it would be my weekend track car. I plan to do that anyway. just later on in life when I have a real job.
4th Gear
Joined: Jan 2013
Posts: 500
Likes: 1
From: Lake Worth, Florida
Weekend warrior.. no it's my daily driver. My goal was to fix my daily driver. But I figured I might as wall spend a little more and make it awesome. If I had the extra cash I would of bought a new DD and then stroked this motor. Then it would be my weekend track car. I plan to do that anyway. just later on in life when I have a real job.
When you were talking about relocating your cat.....would you see it beneficial for a setup like mine to have a downpipe with a cat? I'm looking to keep my car basic for a couple years I/E, tune, suspension. Should I pick up a catless downpipe or a downpipe with a cat? I live in Florida so we can blow smoke errrrwhere.
Stroking this motor would probably be a bad idea. It might generate more tq but, this engine doesn't need it. Me personally would destroke it so that I could have a higher redline and a little bit higher hp.