JaredR1 Posted October 7, 2017 Report Share Posted October 7, 2017 Anyone put a RNC engine in a P80 yet? I've been reevaluating the engine options for my 850R build and some of the P3 T5 engines are looking quite attractive, and also very easy to get one with super low miles. Yes I realize this would be quite a lot less bolt on than a RN swap so I'm trying to gather enough information to determine if it's worth it to go down the RNC path or just work with the shortcomings of the RN options that fit with my build. Link to comment Share on other sites More sharing options...
aloisdecroon Posted October 7, 2017 Report Share Posted October 7, 2017 Some wiki information about RNC engines, With the introduction of the second generation Volvo S40 in 2003 another update to the engine family took place. The new engine was called 'RNC',[38][39] the 'C' standing for 'compact' to emphasise the decrease in overall dimensions. Compared to the previous generation the new engine was 200mm slimmer[nb 2] and 25mm shorter. On turbocharged engines the exhaust manifold and turbine housing were now combined into one part; all engines were equipped with plastic intake manifolds and continuously variable valve timing (CVVT).[40] Link to comment Share on other sites More sharing options...
JaredR1 Posted October 8, 2017 Author Report Share Posted October 8, 2017 Thanks, yes I know what RNC stands for. The issue is with the engine mounts. N and RN engines bolt up the same way but RNC engines have completely different mounts and I'm wondering if anyone has found a solution to that issue yet. Link to comment Share on other sites More sharing options...
thedrill Posted October 8, 2017 Report Share Posted October 8, 2017 The side mount at the crank pulley area still has the two bolt holes for the P80 type mounting on the RNC block, the rear mount is bolted to the transmission. The front forward mount should still bolt to the RNC block as it appears the threaded holes are still there. I have just swapped two RN blocks into 2004 and 2006 S40 t5s, with a little bit of modification. Link to comment Share on other sites More sharing options...
andyb5 Posted October 8, 2017 Report Share Posted October 8, 2017 You'd have to use the RNC intake manifold, the port spacing is different from the N/RN motors. That would mean you have to use the RNC ancillaries as well in order to clear the throttle body. Link to comment Share on other sites More sharing options...
JaredR1 Posted October 8, 2017 Author Report Share Posted October 8, 2017 13 hours ago, thedrill said: The side mount at the crank pulley area still has the two bolt holes for the P80 type mounting on the RNC block, the rear mount is bolted to the transmission. The front forward mount should still bolt to the RNC block as it appears the threaded holes are still there. I have just swapped two RN blocks into 2004 and 2006 S40 t5s, with a little bit of modification. That sounds potentially promising. Makes sense given that the RN and RNC use the same block castings from what I understand. What about the upper torque mount? Is there any reasonable path to attaching a mount up there? Curious, what was the motivation behind an RN swap into a P1? Or was it just the block and you retained the RNC head/accessories/etc? 6 hours ago, andyb5 said: You'd have to use the RNC intake manifold, the port spacing is different from the N/RN motors. That would mean you have to use the RNC ancillaries as well in order to clear the throttle body. Don't really see any insurmountable issues with doing either of those things off the top of my head although this would be on a m4.4 car so running the mechanical throttle over there might be a little interesting, and obviously there'd be some custom intercooler piping involved. Maybe some custom AC and PS lines too? That said, Johan has posted in the past that they have the same port spacing so it may in theory be possible to mount a N or RN manifold on a RNC head, but that may or may not be any easier than just working with the RNC manifold. It's certainly nowhere near bolt on. Link to comment Share on other sites More sharing options...
andyb5 Posted October 8, 2017 Report Share Posted October 8, 2017 Exhaust port spacing is the same on the N/RN/RNC but the intake ports are spaced differently on the RNC. I have compared the two side by side, but don't have pictures. The alternator in the P1s is on canbus, and the PS is electric so there's an extra wrinkle added in adapting them to a P80. Link to comment Share on other sites More sharing options...
JaredR1 Posted October 9, 2017 Author Report Share Posted October 9, 2017 3 hours ago, andyb5 said: Exhaust port spacing is the same on the N/RN/RNC but the intake ports are spaced differently on the RNC. I have compared the two side by side, but don't have pictures. The alternator in the P1s is on canbus, and the PS is electric so there's an extra wrinkle added in adapting them to a P80. Ok.....now we're starting to get into the real wrinkles. I found a picture of it......definitely a slight offset here Looks like it might be close enough to make it work with some sort of adapter plate but I'd rather put effort into making the newer, more efficient RNC stuff work than the other way around. Not having a belt driven PS pump would definitely help there. Is the P1 PS pump on canbus? (or is there anywhere on here that this system has already been discussed in further detail?) Link to comment Share on other sites More sharing options...
thedrill Posted October 9, 2017 Report Share Posted October 9, 2017 4 hours ago, andyb5 said: Exhaust port spacing is the same on the N/RN/RNC but the intake ports are spaced differently on the RNC. I have compared the two side by side, but don't have pictures. The alternator in the P1s is on canbus, and the PS is electric so there's an extra wrinkle added in adapting them to a P80. You could possibly use the 850 type torque mount bracket as the head does not have the four bolt holes, like the 1999 onwards with the aluminum bracket. Link to comment Share on other sites More sharing options...
JaredR1 Posted October 9, 2017 Author Report Share Posted October 9, 2017 2 hours ago, thedrill said: You could possibly use the 850 type torque mount bracket as the head does not have the four bolt holes, like the 1999 onwards with the aluminum bracket. Good idea; that's definitely worth looking into. Also, Andy, did you by any chance compare exhaust manifold bolt patterns as well? Link to comment Share on other sites More sharing options...
German850R Posted October 9, 2017 Report Share Posted October 9, 2017 Exhaust manifold spacing is the same. You can use the rnc gasket on n and rn heads. Link to comment Share on other sites More sharing options...
Commander Riker Posted October 9, 2017 Report Share Posted October 9, 2017 I was just wondering this on the past weekend, but then I had to ask myself... why? Does the RNC deliver increases over the RN motor in any other way other than being smaller? If it's just to do it, I get it. But the RN motor being so much more of a drop in affair, I'm not certain where the real gains would be had. Link to comment Share on other sites More sharing options...
Johann Posted October 9, 2017 Report Share Posted October 9, 2017 RNC T5 is basically an RN 2.5T engine. Link to comment Share on other sites More sharing options...
JaredR1 Posted October 9, 2017 Author Report Share Posted October 9, 2017 4 hours ago, Johann said: RNC T5 is basically an RN 2.5T engine. Does it retain the 2.5T's issues with burning valves? If so, this whole idea is a bust. If not, then a more reliable version of a 2.5T might be a win. Not good for high power/boost builds, but I'm building for the street and the later engines with 9.5:1 compression seem like they would be great for that. Between that and the dual VVT that should make for some really nice low end performance and good fuel economy too. Link to comment Share on other sites More sharing options...
andyb5 Posted October 9, 2017 Report Share Posted October 9, 2017 12 hours ago, JaredR1 said: Also, Andy, did you by any chance compare exhaust manifold bolt patterns as well? Yup. They're the same. 9 hours ago, German850R said: Exhaust manifold spacing is the same. You can use the rnc gasket on n and rn heads. To reiterate the above, the RNC exhaust gasket is 1 piece MLS, which makes it a popular replacement on the earlier motors. I'm running one on my 99 R motor. I'd post a picture but it's on photobucket so... Link to comment Share on other sites More sharing options...
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