Eriks Posted July 7, 2015 Report Share Posted July 7, 2015 Some say the 1.50" intake ports on a 219 head is too much for a street engine. Do you agree and why? 1 Quote Link to comment
Dirttrack510 Posted July 7, 2015 Report Share Posted July 7, 2015 1.5 inch is only a 38mm valve and 240z engines came with 42mm (1.65 inch) from the factory with smaller pistons than an L20b I believe. I would think you could easily go to as big as 44mm (1.75 inch) and be fine. I usually install 44mm intakes on my L16 engines, but I run a big camshaft. I also open my ports to 1.5 inch on my L16 engine. Someone else chime in if I'm wrong. 1 Quote Link to comment
metalmonkey47 Posted July 7, 2015 Report Share Posted July 7, 2015 My A87 head on my LZ had a larger valve and port diameter than that, and I daily drove it for a year with no driveability issues. Quote Link to comment
Dirttrack510 Posted July 7, 2015 Report Share Posted July 7, 2015 http://community.ratsun.net/topic/44530-project-kaboom-l16-grenade-engine-build/?view=getnewpost Here's a link to my L16 race engine build Quote Link to comment
Doctor510 Posted July 7, 2015 Report Share Posted July 7, 2015 Some say the 1.50" intake ports on a 219 head is too much for a street engine. Do you agree and why? Do it, no issues. Quote Link to comment
DanielC Posted July 7, 2015 Report Share Posted July 7, 2015 Considering the availability of Datsun parts in Norway, run it. It will be fine, Quote Link to comment
MicroMachinery Posted July 8, 2015 Report Share Posted July 8, 2015 Good for higher RPM. Run it. Quote Link to comment
scooter Posted July 8, 2015 Report Share Posted July 8, 2015 Dooo it. You shouldnt be lugging it aroud at 1000 rpm anyway. Let er wail! Quote Link to comment
datzenmike Posted July 8, 2015 Report Share Posted July 8, 2015 The 219 head was fitted to the Japanese market L16SSS engine having a special cam (similar to the later stock L20B cam) twin SU carbs and flattop pistons for a compression of 9.3 Yes it will easily work on an L20B but will give the best performance with similar fittings as the L16SSS. Multiple side draft carbs and over size L28 flattops. It's a bit much on a stock L20B and really won't show it true potential.... excellent breathing at high RPMs. Quote Link to comment
Stoffregen Motorsports Posted July 8, 2015 Report Share Posted July 8, 2015 Some say the 1.50" intake ports on a 219 head is too much for a street engine. Do you agree and why? Who says that? They are lying. 1 Quote Link to comment
datzenmike Posted July 8, 2015 Report Share Posted July 8, 2015 It's not so much 'too much'... more like 'more than enough'. It won't turn a stock L20B into a missile but with a larger cam, carbs and some compression it will. Quote Link to comment
Eriks Posted July 8, 2015 Author Report Share Posted July 8, 2015 What i got is a L20B with 280zx flat top pistons. I have a choice between dual SUs and dual Dellorto 40s. The height of the head is exactly 107.0 mm so I believe it has been milled approx 1mm. Quote Link to comment
Doctor510 Posted July 8, 2015 Report Share Posted July 8, 2015 Probably need to use cam tower shims (.015") to maintain the crank/cam center line distance. Quote Link to comment
datzenmike Posted July 8, 2015 Report Share Posted July 8, 2015 What i got is a L20B with 280zx flat top pistons. I have a choice between dual SUs and dual Dellorto 40s. The height of the head is exactly 107.0 mm so I believe it has been milled approx 1mm. That is most excellent news. Yes, stock thickness is 4.248", I get 0.035" removed. Almost 1mm, which is a huge amount removed. This will really raise the compression on a closed chamber head. A very rough estimate...just over 12 to 1 Quote Link to comment
Z-train Posted July 8, 2015 Report Share Posted July 8, 2015 Who says that? They are lying. no kiddin'.The stuff that gets propagated is comical. Quote Link to comment
scooter Posted July 8, 2015 Report Share Posted July 8, 2015 How good is your fuel up there? Might wanna cc that head and get the compression where you want it for the fuel your using. If mikes right that might be a little much for pump gas, but otherwise, hell ya thatll wail Quote Link to comment
datzenmike Posted July 8, 2015 Report Share Posted July 8, 2015 I think on another topic he said gas was way up there in Norway. Quote Link to comment
Stoffregen Motorsports Posted July 8, 2015 Report Share Posted July 8, 2015 That compression ratio will need quite a large cam to use up that cylinder pressure. If parts availability is an issue, it may be hard to find a cam suitable for that piston/head combination. If it were my choice, I would find a dished piston or just bite the bullet and bore it to 89mm, use a KA24DE dished piston (with the top machined to fit), a set of N85 rods and have myself a 2200 long rod. That would be a good use for that head. 1 Quote Link to comment
Eriks Posted July 8, 2015 Author Report Share Posted July 8, 2015 We have two octanes available in Norway, 95 and 98 Quote Link to comment
scooter Posted July 9, 2015 Report Share Posted July 9, 2015 If thats 98 ron method i would go for no more that 11:1, more like 10:1 would be better. If thats rm/2 method bolt that sucker on and let the tire melting begin. I agree with stroffregens post. Quote Link to comment
bilzbobaggins Posted July 9, 2015 Report Share Posted July 9, 2015 are there that many 219 heads floating around in Norway? Quote Link to comment
Eriks Posted July 9, 2015 Author Report Share Posted July 9, 2015 No, bought two from US. Quote Link to comment
Stoffregen Motorsports Posted July 10, 2015 Report Share Posted July 10, 2015 Are you willing to install new pistons in your motor? Quote Link to comment
Eriks Posted July 10, 2015 Author Report Share Posted July 10, 2015 The engine is just overhauled so i will use it as it is. 2 Quote Link to comment
Stoffregen Motorsports Posted July 10, 2015 Report Share Posted July 10, 2015 You're really going to need to watch out for pinging. I would start with the ignition timing somewhere int the 28 degrees total advance range. Do not run the vacuum advance. With this much compression you don't need that extra variable to worry about. Good luck. Quote Link to comment
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