harryjackson Posted January 12, 2020 Share Posted January 12, 2020 Any updates on this @itsLeon Quote Link to comment Share on other sites More sharing options...
itsLeon Posted January 14, 2020 Author Share Posted January 14, 2020 On 12/01/2020 at 21:56, harryjackson said: Any updates on this @itsLeon Well yeah i got an update. After talking about clearances with alot of people and doing some heavy research on it we decided to change to main bearings again so that we have more clearance (from 0.0015 to 0.0025) because of the higher load and much higher RPM. @350Butcher is see that you have the same clearance as me, im changing that based on this article (and talking to king etc): http://www.substech.com/dokuwiki/doku.php?id=oil_clearance_and_engine_bearings Other news. Yesterday i picked up some new buckets because still some aren't in spec. So hopefully i can finish the heads tonight. 3 Quote Link to comment Share on other sites More sharing options...
350Butcher Posted January 15, 2020 Share Posted January 15, 2020 22 hours ago, itsLeon said: @350Butcher is see that you have the same clearance as me, im changing that based on this article (and talking to king etc): http://www.substech.com/dokuwiki/doku.php?id=oil_clearance_and_engine_bearings Cheers for passing this info on...........however I wont be opening up my clearances. My opinion is, that opening them up and especially for the reasons of increased load and revs. You'll just be losing oil pressure and wearing out the bearing faster as the load isn't spread as well across the bearing surface as with tighter clearances. The only advantage of increasing clearances would be additional cooling due to higher flow of oil but at a far higher cost to dropping the oil pressure. In a "modern engine" the components and obviously with the use of high quality oils the heat can be handled so isn't so much a consideration as if you were building say an old war time classic car engine for example. As always just my thought's on it........it's your build and I'm following it with interest. 2 Quote Link to comment Share on other sites More sharing options...
itsLeon Posted January 15, 2020 Author Share Posted January 15, 2020 1 hour ago, 350Butcher said: Cheers for passing this info on...........however I wont be opening up my clearances. My opinion is, that opening them up and especially for the reasons of increased load and revs. You'll just be losing oil pressure and wearing out the bearing faster as the load isn't spread as well across the bearing surface as with tighter clearances. The only advantage of increasing clearances would be additional cooling due to higher flow of oil but at a far higher cost to dropping the oil pressure. In a "modern engine" the components and obviously with the use of high quality oils the heat can be handled so isn't so much a consideration as if you were building say an old war time classic car engine for example. As always just my thought's on it........it's your build and I'm following it with interest. Just passing the info i can find. Well it was a though decision to make to change the bearings but the 'old' ones measured a clearance of 0.0015 while the minimum must be 0.0014. So the new ones will be around 0.0025. We have seen a couple of spun bearings here on build engines here with OEM spec clearances so people told me to go a little bigger. In the article i linked they say: Quote The optimal range of clearance is 0.0015-0.003” (for a bearing with 2” diameter). Looser clearances are more suitable for highly loaded engines working at high rotation speeds and with thicker oils. Tighter clearances provide a better combination of hydrodynamic parameters in less loaded engines working at lower rotation speeds and using thinner oils. This was for me the reason to go a little bigger. In my research i found that there is a rule of thumb (https://www.enginebuildermag.com/2017/03/high-performance-engine-bearings-2/). Quote Most rod and main bearings run best with .0007˝ to .001˝ of clearance for every inch of crankshaft journal diameter, or .0015˝ to .002˝ inches of oil clearance for a 2-inch diameter shaft My crank is 2.36 inches so that calculates to a min of 0.001652 of needed clearance again higher then what i have currently. Quote Link to comment Share on other sites More sharing options...
itsLeon Posted January 22, 2020 Author Share Posted January 22, 2020 Little update: - We have changed the main bearings - We have cleaned most of the parts (such a fun job todo...) - start assembling the engine. 4 Quote Link to comment Share on other sites More sharing options...
davey_83 Posted January 27, 2020 Share Posted January 27, 2020 Nice work space, progress looking great!! 1 Quote Link to comment Share on other sites More sharing options...
itsLeon Posted February 18, 2020 Author Share Posted February 18, 2020 Time for a small update. We discovered that the cams need different timings then the Nissan manual describes. So we contact the manufacture on this issue and started over... We need to find to absolute TDC as show in the image below and then time the cams by how much they push valves down @TDC. So tonight we will once again time the engine. Also new parts have arrived (EGT sensors) 2 Quote Link to comment Share on other sites More sharing options...
RobPhoboS Posted February 18, 2020 Share Posted February 18, 2020 How did you end up discovering they required different timing ? I know the duration of your ones are much higher than my C8's. Quote Link to comment Share on other sites More sharing options...
itsLeon Posted February 18, 2020 Author Share Posted February 18, 2020 40 minutes ago, RobPhoboS said: How did you end up discovering they required different timing ? I know the duration of your ones are much higher than my C8's. Well when we first timed the cams and installed everything we did a check if everything was oke. We then found out that one head was wrong and started to discuss about the cams and the fact that these cams are missing the little knob for the sprockets. After contacting the manufacture about it they told us how to time these cams. so basically we found out by accident. For your cams i would suggest you send JWT an email if it needs special timing or if you can follow the Nissan manual for timing the cams. My bet would be that you can just follow the Nissan manual because i haven't heard this case about the JWT cams and the fact you can still use VVT if im correct. Quote Link to comment Share on other sites More sharing options...
RobPhoboS Posted February 19, 2020 Share Posted February 19, 2020 19 hours ago, itsLeon said: Well when we first timed the cams and installed everything we did a check if everything was oke. We then found out that one head was wrong and started to discuss about the cams and the fact that these cams are missing the little knob for the sprockets. After contacting the manufacture about it they told us how to time these cams. so basically we found out by accident. For your cams i would suggest you send JWT an email if it needs special timing or if you can follow the Nissan manual for timing the cams. My bet would be that you can just follow the Nissan manual because i haven't heard this case about the JWT cams and the fact you can still use VVT if im correct. Ahhh now that makes sense ! Oh I already fitted and used the cams last year (so all cool), just that now I'm in full rebuild mode. You could say my timing was out Nice one, looking forward to seeing how you develop it. My one is going a bit slow at the moment but hoping to have the bottom end back very soon. Quote Link to comment Share on other sites More sharing options...
itsLeon Posted February 28, 2020 Author Share Posted February 28, 2020 Small update: We have a problem installing the cams with the correct timing. Already called the engine building company's but they can't provide a solution... The problem we have is when we put on the sprockets the timing will change when we tighten the bolds. But one company (specialized in old American cars) is coming to help to create a tool to have both the intake and exhaust cams fixed in place. Quote Link to comment Share on other sites More sharing options...
itsLeon Posted March 6, 2020 Author Share Posted March 6, 2020 Finally it's done!!! Took a day of from work so me and my buddy could spend all day on it and we finally have the cams installed and the timing chain is placed and triple checked to make sure everything is according to spec. But my God that was hard, none of the OEM markers are in line with the new cams so we had to calculate everything from scratch. 6 Quote Link to comment Share on other sites More sharing options...
Hansburger Posted March 25, 2020 Share Posted March 25, 2020 Hoppa! 1 Quote Link to comment Share on other sites More sharing options...
davey_83 Posted March 25, 2020 Share Posted March 25, 2020 fantastic effort!!!! 2 Quote Link to comment Share on other sites More sharing options...
itsLeon Posted June 17, 2020 Author Share Posted June 17, 2020 So finally found some time to start working on my car again. The old engine is out of the car so now we can start moving some parts over the new engine. I expect this to finish within the coming 2 weeks and then we start the proces to put everything back into the car. 2 Quote Link to comment Share on other sites More sharing options...
itsLeon Posted June 29, 2020 Author Share Posted June 29, 2020 (edited) So the engine is almost done, will be starting this week to put the engine back into the car Edited June 29, 2020 by itsLeon 5 Quote Link to comment Share on other sites More sharing options...
Stutopia Posted June 29, 2020 Share Posted June 29, 2020 Those headers, phwoooaaarr! 1 Quote Link to comment Share on other sites More sharing options...
harryjackson Posted June 29, 2020 Share Posted June 29, 2020 4 hours ago, itsLeon said: So the engine is almost done, will be starting this week to put the engine back into the car What headers you running? Quote Link to comment Share on other sites More sharing options...
itsLeon Posted June 29, 2020 Author Share Posted June 29, 2020 25 minutes ago, harryjackson said: What headers you running? Those are ISR headers didnt have the money anymore for PPE 1 Quote Link to comment Share on other sites More sharing options...
itsLeon Posted July 9, 2020 Author Share Posted July 9, 2020 (edited) Small update again: The engine is in, transmission is also installed. Now working on the wiring. Parts to make our own 4" intake are being shipped, new laptop also ordered for tuning use. I estimate that at the end of the month we can start the engine for the first time Edited July 9, 2020 by itsLeon 3 Quote Link to comment Share on other sites More sharing options...
itsLeon Posted August 15, 2020 Author Share Posted August 15, 2020 (edited) So the engine is in, most of the wirring is done, custom intake also done expect to start the engine this Friday Edited August 15, 2020 by itsLeon 4 Quote Link to comment Share on other sites More sharing options...
itsLeon Posted August 31, 2020 Author Share Posted August 31, 2020 (edited) We have started the engine for the first time Edited August 31, 2020 by itsLeon 3 Quote Link to comment Share on other sites More sharing options...
itsLeon Posted September 1, 2020 Author Share Posted September 1, 2020 So we got the idle ready. Gonna continu tuning after 2 weeks. 5 Quote Link to comment Share on other sites More sharing options...
itsLeon Posted September 22, 2020 Author Share Posted September 22, 2020 Update time: Started mapping the new engine and the break in of the engine. Found some small problems like to high air intake temp and oil leakage. But other then that engine seems to behave great. 6 Quote Link to comment Share on other sites More sharing options...
alexgv1 Posted September 23, 2020 Share Posted September 23, 2020 The car sounds and looks great! I've been following this thread since I joined the forums 1 Quote Link to comment Share on other sites More sharing options...
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