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Thread: Stromberg 175 CD-2 SE vs. SU Carbs?

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    Default Stromberg 175 CD-2 SE vs. SU Carbs?

    Ok, I've got an early '74 260Z, stock, with the dreaded flat-top Hitachis. They've been sitting forever, so they're gummed up and don't really even work. I went to a local salvage yard, and asked if they had any Datsun carbs, and the guy gives me a pair of carbs, with manifold, that (being the newbie I am) I thought were round tops. It turns out that they are actually Stromberg 175 CD-2 SE carbs, mounted on what looks like a Datsun intake manifold, although I've yet to be able to verify that 100%.

    My question is, how do these Strombergs compare to the SU's, either flat or round top? Should I even mess with them, or should I take them back to the guy and tell them they're not the right carbs for my car? Will they even work?

    Any help on this would be GREATLY appreciated....

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    philo "Z" opher Zedrally's Avatar
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    Don't bother with them.....

    Either O/H the flat tops, contary to some opinion they are a good carb once overhauled, or if money isn't an issue, just pickup a re-built set of round tops.

    HIH
    MOM
    Mike of the Mire

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    So, are they crap compared to the SU's, or simply no better than what I've already got? Reason I ask is they look pretty clean, and I only paid $40 for the set. It would cost me that much just for the Flat top overhaul kit.

    Thanks for the quick response...

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    philo "Z" opher Zedrally's Avatar
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    Yes they are crap.
    Better to spend your $40 on the overhaul kit.
    Mike of the Mire

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    77 260Z Touring

    Bogged but not beaten

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    Thanks...I appreciate the advice

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    Flannigan The C110's Avatar
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    Not to be rude, but i feel a little compelled to interject. Firstly, for what reasons are Strombergs crap? I too would like to know what differences there are between 'proper' Su's [like the ones i have on me c110] vs strombergs? I was considering at one stage buying a set of 'bergs but i knew little about them, aside from the fact that holden successfully used a triple stromberg setup on the LJ Torana GTR XU1. Many other manufacturers im sure, used this setup to their advantage. So why didnt holden decide for a twin, or triple SU setup? I think a little more information, other than 'theyre crap', is needed before a decision is made? Regards,

    Tom
    HGC110-008484 - Why didnt they just badge them as Skylines in Oz!?

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    philo "Z" opher Zedrally's Avatar
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    Quote Originally Posted by The C110

    snip..

    Many other manufacturers im sure, used this setup to their advantage. So why didnt holden decide for a twin, or triple SU setup? I think a little more information, other than 'theyre crap', is needed before a decision is made? Regards,

    Tom
    And Nissan used SU's to their full potential on the L series!
    Mike of the Mire

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    Quote Originally Posted by Zedrally
    Don't bother with them.....

    Either O/H the flat tops, contary to some opinion they are a good carb once overhauled, or if money isn't an issue, just pickup a re-built set of round tops.

    HIH
    MOM
    FWIW, the "Flat-Top's received on Z's in the USA are FAR DIFFERENT than the Flat-Top's received elsewhere. We call them "Boat Anchors" for a reason.

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    I think the flat tops on the 260z here in Australia were the same as in the US.

    I tend to agree that you can't really say Strombergs were garbage anymore than i can say flat tops are garbage. I'd have a read at www.ztherapy.com and make up your own mind.

    in my opinion you should take the strombergs back since you don't know if they are the correct size for your motor and if they are correctly set for your car with fuel metering etc..

    You'd be best off spending extra money on a set of 240z style SU's and correctly building them to suit your L26 once correctly set the SU's shouldn't give you much hassles.

    Oh btw the best SU's in my opinion are Hitachi Su's and not the british made ones for reasons as described in the website above.

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    Former frequent poster sblake01's Avatar
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    Quote Originally Posted by Bambikiller240
    FWIW, the "Flat-Top's received on Z's in the USA are FAR DIFFERENT than the Flat-Top's received elsewhere. We call them "Boat Anchors" for a reason.
    Statements like that are what keep the general opinion of flat tops where it is. Not wanting to start that argument up all over again, I just want to say that I have had success with them on two different cars and know of others who have also had success with them. There isn't much difference between the US and other versions. I have been told (I believe by Bruce Palmer in another thread) that the flat tops I had on my 510 were Datsun Comp. flat tops. They weren't. They came from a 73 240Z. After a rebuild and a little tinkering, they worked fine for me. I also had them on my 73 620, those were from a 260Z. Again, no problems. Don't believe everything you hear, no matter how many times you hear it. Just my experience and my $.02.
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    My statement isn't based on what I've heard, but what I've experienced (just like you). I owned a 73 240Z with them, and drove it for several years. Had them tuned by several different Z Specialty shops (including FAR Performance, one of the leading Z Shops on the West Coast, back in the Day) in that time as well, When I switched to 3-Screw Round-Tops I noticed considerable difference in performance.

    I would be very surprised if OZ or other markets received carbs designed to meet US Federal (or CA) Emission standards.

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    I do remember FAR Performance. The carbs I ran were not stock carbs, per se. As far as the flat tops I used, the 'tinkering' I mentioned made them work much better but also made it tougher for them to pass the emission test. Remember the 'Hamilton Stations?' Anyway, a couple of friends of mine, Paul Corbin, rest his soul, and Elvan Meneses, who sill runs Z car Specality in Upland, and I approached them similarly to how you would approach blueprinting a Holley, or a Rochester carb. As I recall, it involved some drilling, machining, closing off things, etc. This was in the late 70s-early 80s. No one really has much interest in them today so there isn't much being done with them. In their stock form, I would have to agree with the general consesus.
    Last edited by sblake01; 03-18-2005 at 05:13 AM. Reason: Spelling
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    Gavin has made a very good point here. The strombergs you have just aquired have different needles (and other characrteristics) to what you will need. Really the performance of tuned Strombergs vs tuned Flat tops would be much of a muchness. The huge advantage of the flat tops is that they have needles designed and set up specifically for your engine.

    Whip your flat tops off, spend a day cleaning them up and amaze yourself at the difference!

    my $0.02

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    Thanks everyone, I really appreciate all the input. After doing some research, I believe these Strombergs came off of a 2.3L Triumph or Volvo. Either way, they're not right for my application, so I'm taking them back. I didn't even think about the needle / jet sizing. If for no other reason, they probably won't work well because of that. I didn't even think about it, because every car I've owned before now has been F/I.

    Thanks again guys

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