GRpufnstuf Posted November 7, 2015 Report Share Posted November 7, 2015 Hey all, I'm researching clutch upgrades for my '73 620 with stock L16 and shorty 4spd. I'm in the process of gathering parts to swap in a z 5spd, new clutch, rear main seal etc. I was looking for a larger 5 bolt L18 flywheel but they seem to be unobtainium.. The idea being to use a 225 mm clutch plate. so, MY QUESTION(s)... It has been suggested that I use a Heavy Duty Roadster clutch, specifically the pressure plate. I found a decent price on the Roadster HD clutch kit. Will it fit directly into my truck with the 5spd? I found a couple posts that talk about different throwout bearings for car vs truck but that doesn't really make sense to me? Maybe it's something to do with the slave cylinder shape/throw? Also, how much heavier is the clutch pedal with this swap? My current pedal pressure is VERY light which works well in LA daily traffic generally I just want to make sure I have all the parts I need on hand when i do my swap. I'll be renting shop space and delays aren't a good option thanks Quote Link to comment
datzenmike Posted November 7, 2015 Report Share Posted November 7, 2015 so, MY QUESTION(s)... It has been suggested that I use a Heavy Duty Roadster clutch, specifically the pressure plate. I found a decent price on the Roadster HD clutch kit. Will it fit directly into my truck with the 5spd? Yes. All L16s have a 200mm clutch. The Roadster clutch is 200mm. It will bolt right on. I found a couple posts that talk about different throwout bearings for car vs truck but that doesn't really make sense to me? Maybe it's something to do with the slave cylinder shape/throw? Keep the release bearing collar from your 620, it's matched to a 200mm pressure plate, and just replace the release bearing. Also, how much heavier is the clutch pedal with this swap? My current pedal pressure is VERY light which works well in LA daily traffic Well the stock L16 200mm PP has a clamping pressure of 350Kg or 744 pounds. The Roadster PP has a clamping force of 650 Kg or 1,435 pounds. Now this is the stock factory clutches not the after market one size fits all crap. By the looks of it you will have to press about twice as hard. Quote Link to comment
shacks510 Posted November 7, 2015 Report Share Posted November 7, 2015 I drove a roaster clutch a while ago. Can't say it was any stiffer than my stock 200mm clutch. You should be ok. Quote Link to comment
datzenmike Posted November 7, 2015 Report Share Posted November 7, 2015 Was it a Nissan PP or after market? Cause I bet there are a lot of people driving around claiming Roadster PP but they have a 'one size fits all' generic 200mm clutch 'for a Roadster'.. If a Nissan PP it will have stamped on it.... 30210-20111 1 Quote Link to comment
DanielC Posted November 7, 2015 Report Share Posted November 7, 2015 If the the clutch pedal does not feel any stiffer, it is not a roadster pressure plate. Quote Link to comment
banzai510(hainz) Posted November 7, 2015 Report Share Posted November 7, 2015 I went to Schucks a long time ago. I looked up Roadster and they just sold a 510 pressure plate as they are the same size wise but not Pressure wise. Buy the Nissan Roadster PP and youll be fine. If you want soft then stay with the stock clutch. since you have a 74 it might be specifc in the pressure but in most cases when its a 200mm in the early years its just stock.( I don't have my book in from of me) Quote Link to comment
wayno Posted November 8, 2015 Report Share Posted November 8, 2015 I could be wrong, but I thought the roaster clutch cover was specific to the roadster(taller), and one would need to use the roadster collar with the roadster clutch cover. The talk about the throw out bearing being different is likely the collar I mentioned above, as the throw out bearing is pressed on the collar, and from what I have heard, the roadster clutch cover is taller, so the collar would be shorter if indeed the clutch cover is taller/different. If I were you, I would just use your stock flywheel, and buy a clutch kit that has the stock disc, clutch cover, and throw out bearing for your 620 year, then remove the old throw out bearing from your collar noting which way it is pressed on, press the new throw out bearing on your collar the same direction and call it good, this could become a headache real fast unless you get your info from someone that has done what you are wanting to do. You need to understand what you are doing when it comes to this, you see if it is not right, you will have to remove the transmission and figure out what went wrong if it is not right, how many times to want to remove and install the transmission? Will need a shorter drive line also? Hey all, I'm researching clutch upgrades for my '73 620 with stock L16 and shorty 4spd. I'm in the process of gathering parts to swap in a z 5spd, new clutch, rear main seal etc. I was looking for a larger 5 bolt L18 flywheel but they seem to be unobtainium.. The idea being to use a 225 mm clutch plate. so, MY QUESTION(s)... It has been suggested that I use a Heavy Duty Roadster clutch, specifically the pressure plate. I found a decent price on the Roadster HD clutch kit. Will it fit directly into my truck with the 5spd? I found a couple posts that talk about different throwout bearings for car vs truck but that doesn't really make sense to me? Maybe it's something to do with the slave cylinder shape/throw? Also, how much heavier is the clutch pedal with this swap? My current pedal pressure is VERY light which works well in LA daily traffic generally I just want to make sure I have all the parts I need on hand when i do my swap. I'll be renting shop space and delays aren't a good option thanks Quote Link to comment
datzenmike Posted November 8, 2015 Report Share Posted November 8, 2015 Agreed, the L16 is no power house and a stock clutch will contain a stock engine. Wayno this is probably correct. The clutch diameter (probably) doesn't have that much effect on collar length. Here are two charts on collar dimensions and uses. You'll note that some collars are the same for 200mm and 240mm (30501-0H600) and 200mm and 225mm (30501-N1600) From this I would infer that these PPs are the same height. 200mm 225mm and 240mm I did find a reference 3.52" or about 90mm. This is the height from the flywheel surface to the back of the release collar with bearing installed when it is against the diaphragm fingers. As the clutch arm must travel through the same arc as pushed by the slave, various PP heights are adjusted by matching the collar to achieve this 90mm total height. Someone should check this on a perfectly matched and installed clutch assy. 1 Quote Link to comment
banzai510(hainz) Posted November 8, 2015 Report Share Posted November 8, 2015 roadsterr and 510/521 collar and T/O bearing the same , same diaphrame height on PP 200sx 77-79 is 200 mm also but has a different diaprame height. assme the bearing is the same(I assume) 1 Quote Link to comment
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