Tv808 Posted April 17, 2018 Report Share Posted April 17, 2018 what model engine valve springs and retainers fit on the z24 engine that are stiffer Quote Link to comment
datzenmike Posted April 17, 2018 Report Share Posted April 17, 2018 I think the stock are around 115 pounds closed? One of our members 'http://community.ratsun.net/user/2344-sealik/' found a Ford spring that was 130. I can't remember exactly but it was in his build thread. He hasn't been on in a long time and his account is dormant.. 1 Quote Link to comment
G-Duax Posted April 17, 2018 Report Share Posted April 17, 2018 Several cam manufactures here in the US still make performance stuff for the L-series, like Isky & Schneider. 1 Quote Link to comment
banzai510(hainz) Posted April 17, 2018 Report Share Posted April 17, 2018 whats the new cam size? If not much bigger I wouldn't worry about it a z series motor is not a high reving motor as above I belive Isky and Schneider has at one time springs ect...... I use one performance spring with a stiock one since my lift was with in the stock springbind limit. mean use stock outer and perf Inner or visa versa(this was a L motor) Quote Link to comment
Tv808 Posted April 17, 2018 Author Report Share Posted April 17, 2018 292 webb cam with 40 over pistons 9-1 decked block milled head ported and polished compression should be around 10-1 forged rods balanced and lightened crank webber 45 sidedraft. i need a valve spring that will be stiff enough to handle the cam due to the high lift. Quote Link to comment
Doctor510 Posted April 17, 2018 Report Share Posted April 17, 2018 292 webb cam with 40 over pistons 9-1 decked block milled head ported and polished compression should be around 10-1 forged rods balanced and lightened crank webber 45 sidedraft. i need a valve spring that will be stiff enough to handle the cam due to the high lift. You really do not need them stiffer, they will kill the cam. You meed some that have the right closed pressure with fewer coils to compensate for the lift. Quote Link to comment
Tv808 Posted April 17, 2018 Author Report Share Posted April 17, 2018 will the sr20det or ka24de springs work?? or should i just get new stock springs and retainers. due to the original ones probably are worn Quote Link to comment
Crashtd420 Posted April 17, 2018 Report Share Posted April 17, 2018 Schneider shows some for the z24 motor... They have the specs on their websight... They have listing for sr and ka motors too So you could check and compare the info... 1 Quote Link to comment
Tv808 Posted April 17, 2018 Author Report Share Posted April 17, 2018 thank you for the info i appreciate it Quote Link to comment
datzenmike Posted April 18, 2018 Report Share Posted April 18, 2018 The KA24DE springs are smaller and lighter because they use 2 smaller shorter lighter valves. Not an option. The Z24 uses an outer and an inner spring. I assume the two are added together to get to total The outer spring pressure at lift is 115.3 pounds. The inner spring pressure at lift is 57 pounds. Total at lift 172.3 pounds. The outer spring pressure closed is 50.7 pounds. The inner spring pressure closed is 24.3 pounds Total closed pressure of 75 pounds. Quote Link to comment
Tv808 Posted April 18, 2018 Author Report Share Posted April 18, 2018 thank you for the info i appreciate it. i know everyone says the z24 isn’t a motor to build to get hp gains. it was meant for better emissions. the head is built similar to a dodge hemi where as it’s a hemispherical type head. i do know due to the low compression ratio and excessive exhaust burn that the motor is great for turbo. besides that i’m just building it to have a fun datsun/nissan engine that i could eventually put in a datsun 620 or 510 one day when i find one. i’m just a fan of nissan and datsun and have always been since i was a kid. 1 Quote Link to comment
Madkaw Posted April 18, 2018 Report Share Posted April 18, 2018 Keep us updated. The more I read the more I feel that I will be slightly, if not more disappointed with the NapZ motor - especially in my 4x4. After building performance L series motors it will be weird to drive a motor that’s all in at 4K rpm. I see the induction system as being a problem with these motors. Turbo would be nice , but a custom manifold for left hand drive would have to be made . Quote Link to comment
datzenmike Posted April 18, 2018 Report Share Posted April 18, 2018 The problem in a nut shell is that the intake ports are too low on the head and have large bends entering or leaving the valve. Anyone who has looked at an L head will see the intakes are well above the exhaust ports and air falls down into the combustion chamber in a much straighter line. That can't be fixed on the Z series. This would limit high RPM breathing. Other than that, the valves are the same but just slightly longer. With the valves tilted over to their sides the edge of the larger intakes stick down into the cylinder so lift is limited during valve overlap as the piston nears TDC. Also the valves will touch if extended enough, although I don't know how much and again, this could only happen during valve overlap. The good news is the efficient hemi shape and the dual plugs which are very detonation resistant. All good for higher compression or turbo. The Z22 and Z24 have longer stroke than the L20B so much more torque at lower RPM. Quote Link to comment
Tv808 Posted April 19, 2018 Author Report Share Posted April 19, 2018 when i finish my build i will post updates. after this build i’m leaning towards a lb20 build. if my z24 motor does what i expect it to do then i will put it in a 620 or a 510 but i want to keep it old school and build datsun engines instead of going with the sr20det or the ka24de. 1 Quote Link to comment
ItsNapTime671 Posted March 13, 2020 Report Share Posted March 13, 2020 Schneider cams sell valve springs #68020 that’ll support a cam with .468/.468 valve lift, 292/292 degrees duration, 270/270 degrees duration @0.050” (web racing cams, grind number 214). Part Number: 68020 Spring Type: Double Spring Quantity: 8 Outside Diameter: 1.380" Inside Diameter: 0.810" Installed Height: 1.600" Seat Pressure: 110 lbs Pressure @ .600": 240 lbs Spring Coil Bind: 0.910" Quote Link to comment
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.