OZZ240 Posted August 22, 2009 Share Posted August 22, 2009 I want to upgrade the motor in my 240Z from the stock L24 to a stock L28 which will get a mild cam and set of headers later on. I was thinking of using the carbs off the L24 and replacing the needles and springs and bolting those on, so I rang and talked to the local Carb guy about needle and spring sizes to suit the L28 he sugguested going for the British SU and suggested the HS6 which is 1 3/4" in size as parts are easly accessable and cheap for these over the Hitach's and said they are easier to setup and tune. My brother has a set of HS6 and set of HS8 that I can have. The HS8 are 2" in size. I think the 2" will be to big for the L28. Am I better of trying to find the right needle and spring for the Hitach round tops or go for the SU? If I do use the Hitach does anyone know what Needle and Spring sizes I should use? The L28 has a N47 head and a F54 Block I think the pistons have a small dish. Thanks Ian Quote Link to comment Share on other sites More sharing options...
skib Posted August 22, 2009 Share Posted August 22, 2009 Id talk to Steve at Z-Therapy (ZTherapy.com) Quote Link to comment Share on other sites More sharing options...
MONGO510 Posted August 22, 2009 Share Posted August 22, 2009 The 2 liter Roadster was factory equipped with 2" carbs. They are not to big for a 2.8. Take Skib's advice and talk to Z-therapy! they know their stuff! Mongo Quote Link to comment Share on other sites More sharing options...
Tony D Posted August 24, 2009 Share Posted August 24, 2009 If you have access to them, HIF6 or HIF 8's would be an even better choice... I thought the Roadsters had 38mm Hitachi SUs? I think they did, I'm almost 100% positive they did. Quote Link to comment Share on other sites More sharing options...
Xnke Posted August 25, 2009 Share Posted August 25, 2009 Tony is correct, the roadsters are 38mm. 2" SU's are too big for a stock L28, but not a modded one. Quote Link to comment Share on other sites More sharing options...
MONGO510 Posted August 25, 2009 Share Posted August 25, 2009 The hitachis I had were a hair under 2" came of a 2 Liter roadster. They came with the car which had been converted to Mikuni Solex. Maybe they were not stock although they were on a stock manifold and the ports matched? Mongo Quote Link to comment Share on other sites More sharing options...
OZZ240 Posted August 26, 2009 Author Share Posted August 26, 2009 whats the difference between the HF and HIF SU's? Quote Link to comment Share on other sites More sharing options...
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