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Hey all. Before I get flamed I just want to point out I did a search and didn't turn up anything that suited my particular questions. Well one of them anyway.
First: What parts do I need to do this conversion. I was thinking it'd just be the crank and rods from a SR20. Would that be right? Do I need any other pistons or will the SR16's do?
Second: I've come across a Nissan Primera SRi. I haven't seen it yet so I don't know which SR20 is has, DE De or Di. But does anyone know if they're the same internals? IE will any one of those motors do what I need.
If it is the low port DE will it be worth doing the conversion? I'm only paying €150 for the whole car (the bottom end of the engine is perfect, the guy that checked it for me builds engine for a living and he said it was ok). Will I see any usable gains?
I'm looking for a torque boost alright but I don't want to/can't afford to spend big money on parts. Plus labour is going to be cheap since he's a friend.
I'll be using the SR16 block with the SR20 internals. Would 9.6 still be ablout right? That would be safe wouldn't it. Or would it be better to have it higher. If so how do I rasie it? Which pistons should I use?
I'm not a mechanic so I'm not sure on these details.
BTW I drive a Pulsar VZR so I'll be still using the SR16 ECU.
I'll be using the SR16 block with the SR20 internals. Would 9.6 still be ablout right? That would be safe wouldn't it. Or would it be better to have it higher. If so how do I rasie it? Which pistons should I use?
I'm not a mechanic so I'm not sure on these details.
BTW I drive a Pulsar VZR so I'll be still using the SR16 ECU.
I'll be using the SR16 block with the SR20 internals. Would 9.6 still be ablout right? That would be safe wouldn't it. Or would it be better to have it higher. If so how do I rasie it? Which pistons should I use?
I'm not a mechanic so I'm not sure on these details.
BTW I drive a Pulsar VZR so I'll be still using the SR16 ECU.
If you use the 16VE pistons CR would be in the region of 14.5 to 1. With some clever porting and work on the combustion chamber and deeper valve reliefs you can bring the CR down to anything between 11 and 11.5 to 1. Get someone who have the knowledge and equipment to measure your CR and keep in mind that with the higher CR you should increase the fuel octane that you are going to use. If 98 octane RON is available anything between 11 to 11.5 would be a good baseline. If you dont want to spend the money on the headwork and valve reliefs you could get yourself a 1.6mm headgasket, but still get someone to do a proper measurement and fit a set of vernier sprockets to offset the thicker headgasket.
Andreas Miko has posted a chart of CR's on different combination pistons. Look it up and decide what will suit you best
Good luck, Gerry
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Last edited by kiwi-japie : 07-09-2006 at 09:05 AM.
Forgot to mention that you will have to get something to richen up your mixture as well as the stock 16VE Ecu tends to run lean with a 2.0 motor setup.
Last edited by kiwi-japie : 07-09-2006 at 08:55 AM.
Reason: Double post
We've only got 95 ron available unless I go with race fuel and as a daily driver race fuel just isn't going to happen. Any idea what would be the best compression ratio to run with 95 ron?
I must have a look for that chart by Andreas Miko. Should be handy.
Which pistons? 20V or these. I'd be guessing either the first ones, or the second ones with a thick gasket and vernier cam gears. And then a nice set of prothane mounts. Opinions?
I would get SR20DE pistons over SR20VE pistons because of the ringlands. You could go with the jdm 10:1 SR20DE pistons and that would up the compression ratio .5, giving you a 10.8:1 compression. Now with doing that, the biggest cams you can run are your sr16ve cams because of the piston to valve clearance.
Does anyone know the part number for the JDM pistons. Would the UK pistons be different again?
In the link thats posted above it said JDM pistons need machining. I'd rather buy something suited rather than machining something else.
I was just doing a small bit more reading. Most people with the 20VE just put in 16VE cams right? Is there any difference between the rods and crank in a de to a ve? Excluding 4cw and 8cw? If not would it not make sense to use the 20ve pistons? Sorry if its repeating its just very difficult to get any answers that are the same and specially an answer from someone that has done it.
Are there any other differences between the 16ve and 20ve except for crank, rods, pistons and cams?
I think you would get alot more answers of what makes sense if anyone knew what you were trying to do. At least for me reading this thread, I get confused what you are trying to accomplish. You want a high compression 2.0ve out of your 16? There are threads on this subject, in particular a lengthy one where miko answers tons of questions about this kind of thing. I suggest you search it out, and you will have a better idea of how everything fits together. I cant find it right now ***
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Basically I want a 20VE with 16VE cams. Since I have a 16VE I want to know what to change to make it in to a 20VE. I remember seeing that thread beofre aswell but I've searched for it and I can't find it.
well then as above, you need rods, pistons, and crank. That is it. I dont know what compression it will yield you, and I dont know what pistons you can use with your cams. I know that det pistons and rods and a 8 cw crank will fit and hold tons of boost But you dont seem to be headed for boost.
Thanks for clearing that up. I just need to figure out which pistons now. I won't be going with boost so det won't really have any benifit for me other than draining my bank balance.
But you dont seem to be headed for boost.
