andyk_79 Posted October 31, 2014 Posted October 31, 2014 What people do never ceases to surprise me. After posting up a link to a set of twin downdraft carbs with adapters for the standard Z series manifolds (and commenting that I imagine they would be awful) I've found it is not as uncommon a conversion as I thought. Seems a few people (mostly in the USA) have gone down this path, with most agreeing the factory twin Hitachis are better. This is the set up (MSA sells them - must have missed that page when trawling through their website): And an example on an L24: Quote
GTI-Z Posted October 31, 2014 Posted October 31, 2014 They must sell a few of them as they offer two kits, one to suit California emissions, and the other for the rest of the country. I had looked at going in that direction due to the poor condition of my SU's but decided to do the exchange route with Z Therapy. Quote
peter t Posted October 31, 2014 Posted October 31, 2014 Mate if you want to go for something simple do what I did and get a four barrel holly set up from Arizona Z Car. Works a treat. Quote
chris240 Posted October 31, 2014 Posted October 31, 2014 1x holly is good 2x webers is a crowd 3x webers is an orgy... Quote
Six_Shooter Posted October 31, 2014 Posted October 31, 2014 I had those on my car when I first got it. They worked very well, considering that the car hadn't been registered in 10 years, so any run time was minimal in that time. The car always started, and never gave me problems. They could have used a rebuild, and proper set-up, but I never did, because I had planned from the start to go EFI. Actually I had planned to swap an entirely different engine in, but EFI's my L28 instead for several years. So what do you base your idea of "they would be awful" on? Pure conjecture? Quote
andyk_79 Posted October 31, 2014 Author Posted October 31, 2014 So what do you base your idea of "they would be awful" on? Pure conjecture? Yeah it is conjecture. The fact the the intak is being lengthened and the first direction the intake mix has to go is against gravity it just seems counter - intuitive. it got my interest as it's the first time I remember ever seeing a design where the intake mix has to travel upwards. Most of the reviews I've seen suggest they work well enough but that the factory carbs perform slightly better Quote
Six_Shooter Posted November 1, 2014 Posted November 1, 2014 Yeah it is conjecture. The fact the the intak is being lengthened and the first direction the intake mix has to go is against gravity it just seems counter - intuitive. it got my interest as it's the first time I remember ever seeing a design where the intake mix has to travel upwards. Most of the reviews I've seen suggest they work well enough but that the factory carbs perform slightly better There have been MANY intake systems where the fuel/air mixture has to flow "against gravity" over the years. When the fuel is in suspension, it doesn't really work against gravity, it flows with the air movement rather easily. This is one case where you can't judge a book by its cover. Quote
Moderators PB260Z Posted November 1, 2014 Moderators Posted November 1, 2014 There have been MANY intake systems where the fuel/air mixture has to flow "against gravity" over the years. When the fuel is in suspension, it doesn't really work against gravity, it flows with the air movement rather easily. This is one case where you can't judge a book by its cover. Absolutely, a lot of early 1920's vintage cars had updraft carbies. Quote
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