#1
Posted 24 April 2013 - 01:22 PM
I have Natrium-cooled exhaust valves in a Kokill casted head, a L61 Engine Block, Eagle Chrome-Moly Crankshaft, Eagle Chrome-Moly connecting rods, Wiseco Pistons (CR 8:9:1 ), Clevite Rod and Main Bearings bound together by ARP Head Studs. Fast road is with good torque is what I'm looking for. Here's some profiles that looks interesting
1. http://www.catcams.c...log/4603113.pdf
2. http://www.catcams.c...log/4603114.pdf
#2
Posted 24 April 2013 - 01:23 PM
#3
Posted 24 April 2013 - 01:27 PM
#4
Posted 24 April 2013 - 01:27 PM
Good point. Engine was original intended for an SC application.Bin your Wiseco pistons (or flog them to an SC'er) and replace them with higher compression versions, if you're planning on getting any NA power.
#5
Posted 24 April 2013 - 01:29 PM
Such low comp pistons will kill N/A power or dose the head gain it back. Alanoo was pushing over 8000 rpm on the Schrick.
That's close to the limit. Some test data I've seen indicates the crank exits the engine at around 8200rpm.
#6
Posted 24 April 2013 - 01:32 PM
Part # 88958620
Ecotec Crankshaft, billet steel
Internally balanced, full-race, billet 4130 steel crankshaft with
1.888" rod bearings and stock-size main bearings.
Reduced stroke of 3.505" for high RPM use.
#7
Posted 24 April 2013 - 01:34 PM
#8
Posted 24 April 2013 - 01:36 PM
any good ?
Part # 88958620
Ecotec Crankshaft, billet steel
Internally balanced, full-race, billet 4130 steel crankshaft with
1.888" rod bearings and stock-size main bearings.
Reduced stroke of 3.505" for high RPM use.
I'm OK for crank
Stroke reduced by the rods of crank profile?
#9
Posted 24 April 2013 - 01:39 PM
Keep the pistons if you have already fitted them and skim the head
hmmm... Interesting.... have to take the head off so might as well as take it that step further and replace the pistons?
#10
Posted 24 April 2013 - 01:40 PM
#11
Posted 24 April 2013 - 01:45 PM
Keep the pistons if you have already fitted them and skim the head
hmmm... Interesting.... have to take the head off so might as well as take it that step further and replace the pistons?
Might save time and money though..
#12
Posted 24 April 2013 - 01:51 PM
Keep the pistons if you have already fitted them and skim the head
hmmm... Interesting.... have to take the head off so might as well as take it that step further and replace the pistons?
Might save time and money though..
Building it myself so shouldn't be too much on an addition plus I can sell the Wiseco pistons (brand new) to recoup. Plus it's a SAAB head I have so I really don't want to mess with it coz no idea how it's going to preform.
Anybody know where I can pick up 11:1 pistons?
#13
Posted 24 April 2013 - 01:53 PM
Anybody know where I can pick up 11:1 pistons?
Cheap option is rods and pistons from a Z22YH engine (no idea how suitable they are from a strength point of view). Expensive option is to get some custom made as Vocky did.
#14
Posted 24 April 2013 - 01:55 PM
#15
Posted 24 April 2013 - 01:59 PM
#16
Posted 24 April 2013 - 02:04 PM
#17
Posted 24 April 2013 - 02:33 PM
#18
Posted 24 April 2013 - 02:35 PM
As for the cams, I think CompCams stage 3 are probably still the best available, the schrick are similar to stage 1
#19
Posted 24 April 2013 - 03:02 PM
Just get the std 10:1 pistons and do a 0.75mm skim like I did. Should get you around the 11:1 mark.
Also make sure you fit uprated valve springs. You will get float above 7200 rpm.
I have some oem pistons which you can swap with me for your low comp ones
seriously if you want standard you can have some which are in the shed, 30kish on them, just pay postage
z22yh pistons and rods are the cheapest way to get 11:1 CR
As for the cams, I think CompCams stage 3 are probably still the best available, the schrick are similar to stage 1
#20
Posted 24 April 2013 - 03:13 PM
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