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I have never seen a SR18DE but have heard of them. I was wondering if it would be possible to put a SR18DE head on a SR20DE? Will there be any HP to gain from this? Would this even be a good idea? Has anyone tried/thought of this? What would be needed to make this work? Any and all info would be appreciated.
The SR18DE crank has the same strock as the SR20DE which is 86mm.
The piston size of the SR18DE is 82.5mm and SR20DE is 86mm
As far as the head goes it is not worth the effort to put a SR18DE head on a SR20DE bottom end. The valves are alot smaller than on the SR20DE heads.
If you are willing to put in new SR20 valve seats and SR20DE valves, the cumbustion chamber is alot smaller. If I remeber correctly the SR18DE head would give about 11.7 - 1 comp on a SR20DE bottom end. But like I said it is all lost if you do not do the valves and valve seats.
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Thanks for your response to this thread. What else would I need to do? Would I need an ECU because of the comp???? Just want to gather info....just in case.
I have heard of people putting sr20 head on sr18 because of the bigger valves.
But seeing Andres comment about the compression does it mean this swap would cause a lower compression ratio?
Any advice for sr18de owners?
I have heard of people putting sr20 head on sr18 because of the bigger valves.
But seeing Andres comment about the compression does it mean this swap would cause a lower compression ratio?
Any advice for sr18de owners?
And if it lowers the compression, better for bolting a turbo on??
And if it lowers the compression, better for bolting a turbo on??
Right idea, wrong numbers.
If Andreas is right, and probably is, the change would lower the compression ratio down to about 7.3:1 which is too low...Josh
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The SR18DE crank has the same strock as the SR20DE which is 86mm.
The piston size of the SR18DE is 82.5mm and SR20DE is 86mm
As far as the head goes it is not worth the effort to put a SR18DE head on a SR20DE bottom end. The valves are alot smaller than on the SR20DE heads.
If you are willing to put in new SR20 valve seats and SR20DE valves, the cumbustion chamber is alot smaller. If I remeber correctly the SR18DE head would give about 11.7 - 1 comp on a SR20DE bottom end. But like I said it is all lost if you do not do the valves and valve seats.
Read this again, a SR18 head on a DE motor will give you a higher compresssion. The cumbustion chamber of the SR18DE is smaller than the SR20DE head this means the compression will be higher not lower.
SRV and I were reffering to the opposite....butting the sr20 head on sr18de motor.
I have a sr18de motor and was planning swaping the heads for the sr20 head. Bigger valves will help me alot since I already have S3 cams in there.
Just not sure about the effect this would have on compression. I planned to bolt on a turbo later this year as well so can you tell me for sure what kind of compression ratio I would be looking at?
Read this again, a SR18 head on a DE motor will give you a higher compresssion. The cumbustion chamber of the SR18DE is smaller than the SR20DE head this means the compression will be higher not lower.
I thought he was talking about putting a sr20 head on an 18de engine....Josh
SRV and I were reffering to the opposite....butting the sr20 head on sr18de motor.
I have a sr18de motor and was planning swaping the heads for the sr20 head. Bigger valves will help me alot since I already have S3 cams in there.
Just not sure about the effect this would have on compression. I planned to bolt on a turbo later this year as well so can you tell me for sure what kind of compression ratio I would be looking at?
Why not just get a sr20 if the motors are available to you?
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93 SE-R: Blue Bird motor with T28
N/A time 15.1@91.8
Would putting the sr20 head on an sr18 work?
Would it be of any benefit?
I JUST PUT THE SR18 CAM INTO THE SR20 HEAD AND MAN THE CAR PULLS LIKE A TRAIN. IF ITS MIND OVER MATTER THEN I AM HOOKED. I WONT EVEN MENTION THE REV., ITS LIKE A TRUCK LADDEN WITH A SHIP GOING UP A HILL AT HIGH SPEED.
I have never seen a SR18DE but have heard of them. I was wondering if it would be possible to put a SR18DE head on a SR20DE? Will there be any HP to gain from this? Would this even be a good idea? Has anyone tried/thought of this? What would be needed to make this work? Any and all info would be appreciated.
KEN
THIS THING I DID JUST YESTERDAY AND MAN THE CAR PULLS LIKE A HORSE.ALL I DID WAS TO REPLACE THE STOCK CAMS WITH THE SR18 ONES AND INSTANTLY THE REV CHANGED AND THUS HP.THE SIMPLE NX IS AGAIN A GIANT IN THE NISSAN FIELD. I CANT WAIT FOR SUNDAY AT THE ORANGE PARK DRAG STRIP.JAMAICA COOL AND NISSAN RULE :
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