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johnwartjr

Some RN swap questions

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I recently acquired a 2nd 97 850R to mess around with.

The car has a pretty significant knock. After talking with a few others, and having a few local friends take a listen, it seems like it's a rod knock. I'm not 110% sure it's a rod knock, but I'd say I'm reasonably sure.

So, I've been walking through the local pull a part yards, trying to find a B5234. So far, not a lot of luck. Granted, I take a bit of a risk when I grab an engine from a pull a part, but that's another story entirely..

I am seeing a fair number of 99 and up cars, and I know these have the 'RN' engine. I watched a video from ARD about the RN, and the work required to fit the RN engine in an 850 looks like its relatively minor stuff that doesn't add a lot of expense. I linked the video below.

The thing I don't understand yet - how do I decide which cars are good candidates to provide a donor engine? The end result needs to be equivalent or better performance to the original B5234 that came in the car. Ideally, I'd like to go a little better. The car has a 16G on it now, and orange injectors. I am not against a bigger turbo, injectors, tune, exhaust, etc - so I'd like to have some room to grow. I don't plan on going crazy, but I'd like to have some head room.

For example, today I looked at a 2001 V70 XC with a turbo engine - which I think is a 2.4? and I also looked at a 2004 V70 which I believe was a 2.5T. 

I've been trying to read up on this swap, and haven't found a whole lot of solid information. I don't want to waste anyones time - I've made a significant effort to find this information on my own.

If there are links I need to read, and haven't found, I'd appreciate it if you shared them.

 

 

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As far as which block to get, it depends on your goals. The 01-Up HPT motors are supposed to be the strongest and better suited for high HP applications, however I went with an 04-up LPT because they are pretty easy to find and tend to be cheaper, higher compression should give it a little more kick in the low end, and should still be good for around 350whp. As a bonus IIRC 04-up come with the upgraded R manifold.

 

Once you decide what block you want, you can also make a choice to upgrade to the newer accessories (ps pump/reservoir, alternator, ac compressor, a 'cleaner' look) or modify your accessories to work with the RN motor (cheaper, slightly noisier). 

 

Theres tons of other threads on the subject. Here are some to check out:

 

 

http://volvospeed.com/vs_forum/topic/154256-rn-motor-install/?page=1

http://volvospeed.com/vs_forum/topic/141812-850-t5m-project-02-hpt-m56-tt-18t/

 

Some other builds

http://volvospeed.com/vs_forum/topic/151740-my-motor-build-thread/

http://volvospeed.com/vs_forum/topic/161434-1996-850r-more-functional-version/?page=15

http://volvospeed.com/vs_forum/topic/157483-another-rn-20g-my-build-thread/?page=1#entry2198170

http://volvospeed.com/vs_forum/topic/152263-njgbs-1998-v70-awd-project-good-grief/

PCV Stuff:

http://volvospeed.com/vs_forum/topic/157178-new-motor-build-need-some-direction/?page=4

 

Helpful tutorials

(Oil Sump reseal):

http://www.matthewsvolvosite.com/forums/viewtopic.php?t=31236

Front Cam Seals/timing (pics are down though):

http://volvospeed.com/vs_forum/topic/159754-how-to-replacing-1999-vvt-engine-cam-seals-and-setting-timing/

 

You also have to figure out what to do with fuel lines, I recommend changing to the 98 FPR setup pictured here:

http://www.matthewsvolvosite.com/forums/viewtopic.php?p=355576#p355576

Using an 05-up fuel rail/fuel Supply Line and running a vacuum line to the tree for the return but heres some more discussion:

http://volvospeed.com/vs_forum/topic/170371-rn-swap-fuel-line-mod-questions/

Youll probably want to upgrade your fuel pump as well, I recommend a DW200 but here's what you can expect:

http://volvospeed.com/vs_forum/topic/50783-walbro-255lph-hp-pump-install/?mode=linear

 

 

There are a bunch of threads but that should be a pretty good starting point


 

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If it just has rod knock then I would do a compression and leak down test and if that checks out good, throw some h-beam connecting rods in and go...you'll never have to deal with a bent rod again, I wouldn't even play around with an RN unless it had h-beams. Seriously, if your going to be beating on it/tuning it, that's the number 1 failure in these motors especially with stock turbos. Also I wouldn't run that engine very long with the knock it will spin a bearing and throw a rod real soon. As long as the crank is good you'll be fine with new bearings and h-beams but that's just me...

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18 hours ago, volvoguy23 said:

If it just has rod knock then I would do a compression and leak down test and if that checks out good, throw some h-beam connecting rods in and go...you'll never have to deal with a bent rod again, I wouldn't even play around with an RN unless it had h-beams. Seriously, if your going to be beating on it/tuning it, that's the number 1 failure in these motors especially with stock turbos. Also I wouldn't run that engine very long with the knock it will spin a bearing and throw a rod real soon. As long as the crank is good you'll be fine with new bearings and h-beams but that's just me...

The logic with the RN was simply that I'm more likely to find a newer engine with lower mileage and therefore find one in better shape.

The current engine has low compression. 125 in 1, 150 in 2-5. My 97 wagon with 130k has about 175 on each cylinder. I don't have the right equipment to do a leakdown test. Not saying I'm against getting it - just think in this case, another engine is a better choice considering my situation. I may be wrong - wouldn't be the first time.

The engine has 236k on it - assuming it's not had the odo gears broken at any point, or a lower/higher mileage cluster swapped in, etc - but the maintenance history I got with the car leads me to believe if it's not 236k, it's dang close. I bought it from a kid who had been doing his own maintenance and I'm not sure how confident I am in his mechanical ability. I'm not sure how much it's been driven with this knock.

I changed the oil, and strained the drain pan through a filter and didn't find any shavings or anything.

With my current situation, I can throw an engine stand in my garage and freshen up an engine, and then do my actual swap in one weekend. Having a disabled car sitting in my driveway long-term while parts go to the machine shop and I rebuild this engine is not a possibility. So, I need it to run so I can pull it in and out of the driveway as I work on things, etc. With my work schedule and life, I don't even know exactly when the swap would go down - it could take months to have a free weekend to really focus on taking an engine out and putting another one in.

Thanks for the links, I'll read them later!

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I just did an RN swap but have a question on VVT my engine was out of an 04 and has the vvt on the exhaust- at picknpull I see s70 & S60 cars with the vvt only on the intake, where was the cutoff ? or was it a lpt-na-hpt thing >  I second the use the later accessory bracket - I swapped mine and it is much neater and smaller- I had the whole donor car so it cost me nothing plus get an alternator amp upgrade

 

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Early NA RN cars had VVT in the intake, early turbo RN cars had VVT on the exhaust.

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9 minutes ago, BlackT5 said:

Early NA RN cars had VVT in the intake, early turbo RN cars had VVT on the exhaust.

Skloon, this is correct.

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