MY350Z.COM Forums - View Single Post - --->jkenefic version 3.0 build<---

MADScientist · 05-30-2008, 07:43 PM

Well I wanted to wait a while to post the results of the engine rebuild to make sure that the parts I used were going to hold up to the power levels I was after..... And the story goes a little something like this...

As a lot of you know I was a victim of the dreaded headlift on a sleeved motor like quite a few others on this forum. I came across a hell of a deal on a 100mm bore Darton sleeved block when my first build went due to a steam pocket in the cooling system. The deal was so good I thought "how can I pass this up?" Well 1200 miles later I should have! Heads started lifting so bad that not even wastegate spring boost would hold. Now in all fairness, I think my headlift issue was a combination of improper sleeve installation and the machine shop not resurfacing the block (checked it for straightness and left it at that). The motor made great power, but once the heads started lifting and after talking to several other people with the same issues I decided to start over with a new core block.

After many hours of research on torque to yield bolts and talking to the few true experts in the VQ community I decided on the following short block build:
-----------------------------------------------------------------------------
-Forged Performance Arias 9.0 Extreme Duty Pistons .020" overbore
-Eagle Rods
-Revup Oil Pump
-ARP Main Studs
-STOCK VQ35HR HEAD BOLTS
-STOCK VQ35HR HEAD GASKETS
-Evans NPG Coolant
-----------------------------------------------------------------------------
Everything else was from the original build:
-Cosworth Heads
-JWT C2 Cams
-Revup lower intake manifold w/ Crawford upper
-AMS Radiator
-Greddy Coolant Expansion Tank
-Custom Oil Cooler
-ATS Triple Disk Clutch
-HKS FCon VPro
-HKS EVC 6
-HKS AFK
-AlkyControl jkenefic spec meth kit

Only other change that was made was the turbo upgrade to the 20Gs thanks to Mr. Mike Edens!

When I told Sharif that I was going to do this build he thought I was nuts

And to be honest so did I! So with just 20 days left before ZDayZ I got started on pulling the engine and 13 days later I was ready for tuning!!
At this point I was not going to let this freaking car beat me. So after much debate, Sharif and I decided to give it a go and see if the myth of the STOCK HEAD BOLTS was real or not. Only slight modification was needed to the DE block to use the HR head gaskets. The HR gaskets redirect the coolant flow around the exhaust ports which is a far better design for FI application. IMO, these gaskets are the best thing available for a build on the market including the HKS. I am happy to report that Jim Wolf knows what the heck he is talking about. Sharif pulled no punches on the tuning and we are making awesome power on the dyno with pump gas and methanol. The only reason we stopped tuning was this is all the power a single Walbro 255 will support. The true test will be the longevity of this build, but so far so good... 45+ dyno pulls, ZDayZ, and some "airstrip" runs later and absolutely no signs of head lift! I do not have the dyno charts from Forged Performance, but I recently dynoed the car at my shop in Indy and the numbers are virtually identical to what we saw in GA.

Next step... figure out how to put this power to the ground and run a good time in the 1320.

05-30-2008, 07:43 PM	#1
MADScientist Registered User Join Date: Jun 2005 Location: Indianapolis, IN Posts: 393 iTrader: (3)	--->jkenefic version 3.0 build<--- HR parts discussion Well I wanted to wait a while to post the results of the engine rebuild to make sure that the parts I used were going to hold up to the power levels I was after..... And the story goes a little something like this... As a lot of you know I was a victim of the dreaded headlift on a sleeved motor like quite a few others on this forum. I came across a hell of a deal on a 100mm bore Darton sleeved block when my first build went due to a steam pocket in the cooling system. The deal was so good I thought "how can I pass this up?" Well 1200 miles later I should have! Heads started lifting so bad that not even wastegate spring boost would hold. Now in all fairness, I think my headlift issue was a combination of improper sleeve installation and the machine shop not resurfacing the block (checked it for straightness and left it at that). The motor made great power, but once the heads started lifting and after talking to several other people with the same issues I decided to start over with a new core block. After many hours of research on torque to yield bolts and talking to the few true experts in the VQ community I decided on the following short block build: ----------------------------------------------------------------------------- -Forged Performance Arias 9.0 Extreme Duty Pistons .020" overbore -Eagle Rods -Revup Oil Pump -ARP Main Studs -STOCK VQ35HR HEAD BOLTS -STOCK VQ35HR HEAD GASKETS -Evans NPG Coolant ----------------------------------------------------------------------------- Everything else was from the original build: -Cosworth Heads -JWT C2 Cams -Revup lower intake manifold w/ Crawford upper -AMS Radiator -Greddy Coolant Expansion Tank -Custom Oil Cooler -ATS Triple Disk Clutch -HKS FCon VPro -HKS EVC 6 -HKS AFK -AlkyControl jkenefic spec meth kit Only other change that was made was the turbo upgrade to the 20Gs thanks to Mr. Mike Edens! When I told Sharif that I was going to do this build he thought I was nuts And to be honest so did I! So with just 20 days left before ZDayZ I got started on pulling the engine and 13 days later I was ready for tuning!! At this point I was not going to let this freaking car beat me. So after much debate, Sharif and I decided to give it a go and see if the myth of the STOCK HEAD BOLTS was real or not. Only slight modification was needed to the DE block to use the HR head gaskets. The HR gaskets redirect the coolant flow around the exhaust ports which is a far better design for FI application. IMO, these gaskets are the best thing available for a build on the market including the HKS. I am happy to report that Jim Wolf knows what the heck he is talking about. Sharif pulled no punches on the tuning and we are making awesome power on the dyno with pump gas and methanol. The only reason we stopped tuning was this is all the power a single Walbro 255 will support. The true test will be the longevity of this build, but so far so good... 45+ dyno pulls, ZDayZ, and some "airstrip" runs later and absolutely no signs of head lift! I do not have the dyno charts from Forged Performance, but I recently dynoed the car at my shop in Indy and the numbers are virtually identical to what we saw in GA. Next step... figure out how to put this power to the ground and run a good time in the 1320. __________________ 05 350Z TT Last edited by MADScientist; 06-04-2008 at 06:58 PM.