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Old 2nd January 2019, 06:57 PM   #41 (permalink)
Jimbostir is Wondering if Andy H has lost his Pistons?.
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29D53D54-596A-4FD2-B9B4-19E76BC827C5.jpeg
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Old 3rd January 2019, 11:22 AM   #42 (permalink)
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I've been thinking about what exactly to do with This over the last month or so. Being the Xmas period and speaking to various people with beer involved I've now decided to pull the block out and put some forged internals (reasonable priced stiff) with an N1 pump and spline drive kit. This way I can wind the turbos up to about 1.5-1.6 bar and not have to worry about it. Pistons I'm thinking 87mm to get the 60cc extra (which I know isn't much but I'm going to get the block bored anyway)
Il be able to paint the block nicely and clean the bay up too. I've not budgeted for this (time or money) so it'll be a project that I hope to get running late summer, and run in ready for mapping. 600+hp flywheel is my goal which is very achievable. The goal is to get as quicker spool and low down torque I can with 2.6L
Sound like a good plan my only advise would be to not focus on capacity for your rebore at this level the extra capacity will make no noticeable difference. These blocks are now getting very difficult to source second hand (read expensive). Therefore if something goes wrong at 87mm your block will be scrap or you will need to sleeve it (again expensive).

Why not go 86.5mm then you have some margin for a future rebuild?
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Old 3rd January 2019, 11:26 AM   #43 (permalink)
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Another thing I did was this...Attachment 247875
Taking away the sharp edge will help reduce hot spots and also will help flow of gasses around the valves. I believe that on the gt500 head they took the lump out all together but I donít want to kill response off boost completely.
Thats the squish pad and its purpose is to transfer heat away from the piston and prevent detonation, it has nothing to do with flow or response.

Interestingly if you search for pictures of nismo built heads they remove the quish pad on one side of the chamber (exhaust from memory). Other engine builders remove them completely

They will effect how det limited an engine is on a certain grade of fuel and I have never seen any results with/without to prove any benefit
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Old 3rd January 2019, 02:38 PM   #44 (permalink)
Jimbostir is Wondering if Andy H has lost his Pistons?.
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Sound like a good plan my only advise would be to not focus on capacity for your rebore at this level the extra capacity will make no noticeable difference. These blocks are now getting very difficult to source second hand (read expensive). Therefore if something goes wrong at 87mm your block will be scrap or you will need to sleeve it (again expensive).

Why not go 86.5mm then you have some margin for a future rebuild?
Good advice there. Yes 86.5 might actually be an option. Il have a think about that for sure. Itíll still give me 30cc I suppose too.
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Old 3rd January 2019, 03:20 PM   #45 (permalink)
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Good advice there. Yes 86.5 might actually be an option. Il have a think about that for sure. It'll still give me 30cc I suppose too.
1.15% increase so on your target 550hp, 6.3 hp! (assuming the turbos are not maxed out), with a corresponding 1.15% reduction the in the point the turbos build boost.
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Old 4th January 2019, 03:31 PM   #46 (permalink)
Jimbostir is Wondering if Andy H has lost his Pistons?.
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Somebody on here I know may have a set of 87mm Tomei pistons I may use if the price is right otherwise if I go cp,wossner,wiseco etc I will go 86.5mm. Let’s see what comes up.
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Old 8th January 2019, 11:34 PM   #47 (permalink)
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Have you considered going higher compression? 9:1?
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Old 9th January 2019, 09:44 AM   #48 (permalink)
Jimbostir is Wondering if Andy H has lost his Pistons?.
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I've considered everything. I'm going to stick with standard comp ratio as its a good for reliability.
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Old 9th January 2019, 08:16 PM   #49 (permalink)
Jimbostir is Wondering if Andy H has lost his Pistons?.
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....so Iíve not been doing too much over the last few weeks. I had some spare time yesterday so decided to give the engine bay, block and gearbox a pressure wash down.67A29C6C-760A-4BF3-ABF8-4BE85293D164.jpeg
A bit of a rubbish pic but you get the idea!
Some more stuff coming including a supertec spline drive kit and Tomei sump baffle. Engine stand arrived today so il get a pic once the blocks on it.
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Old 11th January 2019, 06:50 PM   #50 (permalink)
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Sump off and ready for me to clean up. I also donít know where the snap ring from the off side drive shaft is so I popped the front diff casing off but too have a look inside. It wasnít in there so I refitted the front plate. 552A81AE-13BE-4F7E-B200-B22600D0F31E.jpeg
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Old 11th January 2019, 06:52 PM   #51 (permalink)
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Old 11th January 2019, 06:53 PM   #52 (permalink)
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Old 11th January 2019, 07:31 PM   #53 (permalink)
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Oooh nice work!
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Old 11th January 2019, 08:29 PM   #54 (permalink)
Jimbostir is Wondering if Andy H has lost his Pistons?.
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Thanks. It’s actually quite good fun. I need to find a long 5mm drill bit to use on the sump for the tomei sump baffle. https://youtu.be/HC5G6DuKDNs
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Old 11th January 2019, 10:48 PM   #55 (permalink)
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Some good ideas here

https://youtu.be/E1sacK_wCio

https://youtu.be/M_3prtDBQOc
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Old 16th January 2019, 06:17 PM   #56 (permalink)
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29BC471A-DFCC-4F5F-8B97-B02DD3D00F0D.jpeg...supertec spline drive kit arrived today. Very nice bit of kit and fast delivery. Tomei sump baffle is also here so all I’ve got to do is get a pump to put the spline drive kit in and I will have collected all the engine oiling modifications
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Old 16th January 2019, 10:10 PM   #57 (permalink)
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Love the picture!! That’s right no RB gear kit comes close to the Supertec Spline Drive kit!
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Old 21st February 2019, 02:24 PM   #58 (permalink)
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A quick update

Things haven't really moved on with this a lot, but I have been collecting parts. I've had a couple of hours spare this afternoon so thought it would be a good opportunity to pop a cam in and measure the valve clearances. If I'm honest I've not been looking forward to doing it because I thought it would be boring.
It's actually not that tedious. I just did the exhaust side for now.
As I understand the figures I'm looking for are 0.38mm ex, 0.45mm in. Nissan say +-.03mm on both sides.
It was a little awkward getting the feelers in but much easier after I "adjusted" them.image.jpeg
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Old 21st February 2019, 02:26 PM   #59 (permalink)
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Old 21st February 2019, 02:28 PM   #60 (permalink)
Jimbostir is Wondering if Andy H has lost his Pistons?.
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This is what I got, so actually not bad.
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