Spoolup Posted September 22, 2009 Share Posted September 22, 2009 (edited) I have received the 2 x 95mm stroke cranks. I am going to build a new bottom end for my engine using one of them. I will use the exact same supporting parts ( head, turbo, cams, exhaust etc etc ) as on my current RB30/25. This way I can do a back to back comparison between the two engines ( apples to apples ) and overlay the two dyno charts. By doing this there will be something to compare the stroker crank setup to, as opposed to just building a completely new engine and having no base as a comparison. I am just waiting on the new rods to go with the cranks and I can start the build. Ill post up some pics of the cranks soon. Edited September 22, 2009 by Spoolup Link to comment https://www.sau.com.au/forums/topic/212607-crank-strength-and-upgrading-options/page/10/#findComment-4839450 Share on other sites More sharing options...
Gerg_R31 Posted September 23, 2009 Share Posted September 23, 2009 I have received the 2 x 95mm stroke cranks. I am going to build a new bottom end for my engine using one of them. I will use the exact same supporting parts ( head, turbo, cams, exhaust etc etc ) as on my current RB30/25. This way I can do a back to back comparison between the two engines ( apples to apples ) and overlay the two dyno charts. By doing this there will be something to compare the stroker crank setup to, as opposed to just building a completely new engine and having no base as a comparison.I am just waiting on the new rods to go with the cranks and I can start the build. Ill post up some pics of the cranks soon. are the cranks balanced? or knife edged like the other stroker cranks? Link to comment https://www.sau.com.au/forums/topic/212607-crank-strength-and-upgrading-options/page/10/#findComment-4843198 Share on other sites More sharing options...
Spoolup Posted September 24, 2009 Share Posted September 24, 2009 Balanced but not knife edged. Link to comment https://www.sau.com.au/forums/topic/212607-crank-strength-and-upgrading-options/page/10/#findComment-4844775 Share on other sites More sharing options...
Travis Trayhern Posted September 29, 2009 Share Posted September 29, 2009 sounds very intresting, hope it goes smooth the build up and has some nice improvments throughout the power range. what sort of price is this kit? I have received the 2 x 95mm stroke cranks. I am going to build a new bottom end for my engine using one of them. I will use the exact same supporting parts ( head, turbo, cams, exhaust etc etc ) as on my current RB30/25. This way I can do a back to back comparison between the two engines ( apples to apples ) and overlay the two dyno charts. By doing this there will be something to compare the stroker crank setup to, as opposed to just building a completely new engine and having no base as a comparison.I am just waiting on the new rods to go with the cranks and I can start the build. Ill post up some pics of the cranks soon. Link to comment https://www.sau.com.au/forums/topic/212607-crank-strength-and-upgrading-options/page/10/#findComment-4851846 Share on other sites More sharing options...
Gerg_R31 Posted October 21, 2009 Share Posted October 21, 2009 anything new? Link to comment https://www.sau.com.au/forums/topic/212607-crank-strength-and-upgrading-options/page/10/#findComment-4893079 Share on other sites More sharing options...
Gerg_R31 Posted November 11, 2009 Share Posted November 11, 2009 I've been playing around with an engine dyno/ calculator simulator and its calculated roughly a before and after figures of horse power torque etc with the stroker crank (as long as i have had all of the motors figures including flow figures at each measured level, i have gotten very similar to what has been acheived on a real dyno -/+ 1-3hp) all 4 have exactly the same specs as you will see, though what is not shown is both have a 64cc in combustion chamber, 10cc piston dome, 4cc valve releif in piston and a flush deck height this is not a garanteed before and after power results with the stroker crank but a simulation/ comparasion of what results may be expected with only change in stroke, results will vary depending on supporting internal and external componants Non-Turbo i have also added a turbo set up, everthing is still exactly the same, just with a turbo of which i chose from a drop down menu in the program. I am also aware that different turbos and supporting mods will change the end results Turbo Link to comment https://www.sau.com.au/forums/topic/212607-crank-strength-and-upgrading-options/page/10/#findComment-4930763 Share on other sites More sharing options...
Rolls Posted November 11, 2009 Share Posted November 11, 2009 Be interesting to see what numbers that program gives for a 3L and then overlay the power/torque curves on the same graph, give a nice visual representation of where in the rev range the gains will be had. Link to comment https://www.sau.com.au/forums/topic/212607-crank-strength-and-upgrading-options/page/10/#findComment-4930885 Share on other sites More sharing options...
Spoolup Posted November 11, 2009 Share Posted November 11, 2009 I will be assembling the new stroker bottom end soon. The custom rods arrived today This will be run on my exact same setup that I have used with the 3.0L bottom end. Same turbo, head, comp ratio, cams, exhaust, etc etc So I will be able to overlay my previous setup compared with the stroker engine ( ie dyno power and torque curves ) So a straight up comparison will be available. Link to comment https://www.sau.com.au/forums/topic/212607-crank-strength-and-upgrading-options/page/10/#findComment-4930907 Share on other sites More sharing options...
Gerg_R31 Posted November 11, 2009 Share Posted November 11, 2009 (edited) same specs as in previous post dyno1 is the rb30de the dyno2 is the stroker rb34de Non Turbo Turbo Edited November 11, 2009 by Gerg_R31 Link to comment https://www.sau.com.au/forums/topic/212607-crank-strength-and-upgrading-options/page/10/#findComment-4930980 Share on other sites More sharing options...
Spoolup Posted November 11, 2009 Share Posted November 11, 2009 Wait for the real world stuff :-) Link to comment https://www.sau.com.au/forums/topic/212607-crank-strength-and-upgrading-options/page/10/#findComment-4931028 Share on other sites More sharing options...
nzeder Posted November 11, 2009 Share Posted November 11, 2009 Trial cranks due next week So looks like these are not full counter weighted (assume the pic is of the 95mm stroker crank) I would have thought if you were going to the effort of building a custom crank it would be fully counter weighted? Would the 95mm stroke generate more harmonics and having it full counter weighted might help reduce some of this? I am not an engine builder or engineer so just putting this out there for others more in the know to reply with more logical info. Love the idea of a 3.4l hmm if my RB26DE powered 260z (shell still in bits) does not cut it looks like I might have to consider installing one of these stroker crank like this into a RB30 bottom end and slap on my 26 head for 3.4L of NA power Link to comment https://www.sau.com.au/forums/topic/212607-crank-strength-and-upgrading-options/page/10/#findComment-4931917 Share on other sites More sharing options...
Rolls Posted November 12, 2009 Share Posted November 12, 2009 So looks like these are not full counter weighted (assume the pic is of the 95mm stroker crank) I would have thought if you were going to the effort of building a custom crank it would be fully counter weighted Yeah I was going to say how did you do all the calculations for the size and shape of the counter weights and balance it? Link to comment https://www.sau.com.au/forums/topic/212607-crank-strength-and-upgrading-options/page/10/#findComment-4933022 Share on other sites More sharing options...
Spoolup Posted November 12, 2009 Share Posted November 12, 2009 (edited) As these are the trial / prototype cranks we just copied the std crank. The std crank does a terrific job and sees 10000 rpm in serious drag engines. Why reinvent the wheel. Having said that - if I have any dramas with these cranks its an easy job to have the next version redrawn into full counter weight cranks. I have had the cranks checked and balanced here in Oz - all good. Yeah I was going to say how did you do all the calculations for the size and shape of the counter weights and balance it? Edited November 12, 2009 by Spoolup Link to comment https://www.sau.com.au/forums/topic/212607-crank-strength-and-upgrading-options/page/10/#findComment-4933034 Share on other sites More sharing options...
axe s Posted November 14, 2009 Share Posted November 14, 2009 so is there an expected date of release?? im starting to get some blow-by in my 25... i don't think it will last to much longer... lol.. Link to comment https://www.sau.com.au/forums/topic/212607-crank-strength-and-upgrading-options/page/10/#findComment-4936236 Share on other sites More sharing options...
Bond Posted December 3, 2009 Share Posted December 3, 2009 Any updates???? Link to comment https://www.sau.com.au/forums/topic/212607-crank-strength-and-upgrading-options/page/10/#findComment-4969885 Share on other sites More sharing options...
Spoolup Posted December 24, 2009 Share Posted December 24, 2009 (edited) SPOOL Billet 4340 95mm crank SPOOL 4340 I beam conrods CP custom pistons Edited December 24, 2009 by Spoolup Link to comment https://www.sau.com.au/forums/topic/212607-crank-strength-and-upgrading-options/page/10/#findComment-5003438 Share on other sites More sharing options...
NYTSKY Posted December 24, 2009 Share Posted December 24, 2009 Looks the goods! What can these rev too? Link to comment https://www.sau.com.au/forums/topic/212607-crank-strength-and-upgrading-options/page/10/#findComment-5003454 Share on other sites More sharing options...
Spoolup Posted December 24, 2009 Share Posted December 24, 2009 no idea.. lol Will find out soon Revs are irrelevant anyway. Link to comment https://www.sau.com.au/forums/topic/212607-crank-strength-and-upgrading-options/page/10/#findComment-5003653 Share on other sites More sharing options...
N1GTR Posted December 24, 2009 Share Posted December 24, 2009 What makes you say revs are irrelevant? Also, do you know the rod stroke ratio of this kit? Link to comment https://www.sau.com.au/forums/topic/212607-crank-strength-and-upgrading-options/page/10/#findComment-5003799 Share on other sites More sharing options...
shanef Posted December 24, 2009 Share Posted December 24, 2009 What makes you say revs are irrelevant?Also, do you know the rod stroke ratio of this kit? They are as relevant as a 7000rpm limit on the std crank. Link to comment https://www.sau.com.au/forums/topic/212607-crank-strength-and-upgrading-options/page/10/#findComment-5003813 Share on other sites More sharing options...
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