Tristin Posted August 4, 2012 Report Share Posted August 4, 2012 Sweet fab skills! Was this the manifold that was on eBay?- if not, I know theres another one for sale then. Good work. Quote Link to comment
datsundash Posted August 4, 2012 Report Share Posted August 4, 2012 Looks freaking awesome! I love the intake! Its cool seeing that on a dirty engine too, it makes the carb look even better. When I first read 4 barrels of fury the first thing that came to mind was dual sidedrafts. DO you have any jetting information for us? Quote Link to comment
Farmer Joe Posted August 4, 2012 Report Share Posted August 4, 2012 i see youve wired the secondaries closed... while the 4 barrel is cool, why no go for the 2300 series holley? hows it run, anyways? how many CC is the engine? Quote Link to comment
Siqx20 Posted August 4, 2012 Report Share Posted August 4, 2012 Thats alot of carb.. Quote Link to comment
Siqx20 Posted August 4, 2012 Report Share Posted August 4, 2012 Where did u get the intake for the headlight?? I have been looking for one for a while.bit not even sure what its called... Quote Link to comment
ggzilla Posted August 4, 2012 Report Share Posted August 4, 2012 Two barrels of Fury, since the secondaries are disconnected. How's it run? Quote Link to comment
Tristin Posted August 4, 2012 Report Share Posted August 4, 2012 Where did u get the intake for the headlight?? I have been looking for one for a while.bit not even sure what its called... Ive been thinking about printing a few out... maybe even set them up for some sort or insertable filter. If you google 'headlight intake funnel' there are a bunch of cheap options. Quote Link to comment
Siqx20 Posted August 4, 2012 Report Share Posted August 4, 2012 yeah i been thinking about getting one and making a air box type of thing where a cone filter can be inserted. then maybe a injen hydroshield to avoid any water getting in the intake. Quote Link to comment
O.D.D. Posted August 4, 2012 Report Share Posted August 4, 2012 So...long ago... I was told by a long time Datsun guy that most of the "Dual plane" and "Dual Port" Vertial intake manifolds, as well as the Various Single Sidedraft Manifolds, came about because of restrictions in various SCCA and other racing classes. Old ITC class rules, circle track restriction, single carb glasses, etc. He said, essentially, they are inferior to Dual Side Drafts of almost any kind (other than late model flattops) At the time my 510 had an Offy 'Dual Plane" and I was encouraged to return it to Pre-smog stock for the Weber. I remember him going on something about 90 deg bends and air velocity, restricted port sizing (especially on offys) and necessary jetting needs VS fuel mixture issues of todays gas... I ended up hunting down a set of SU's and have been infatuated with them since.... Anyhow, I am not trying to be a downer, I am just curious.... Its clear that you have the skill to get serious Fabbing done, What was it that led you to want this setup enough to do the quality work needed? Was it just easier and less costly to obtain and fab up? (it DOES look awfully sick :thumbup: with it all said and done) No doubt it is far superior to the gawdawful stock Carb on a 710 (which I currently suffer on mine) Quote Link to comment
ggzilla Posted August 4, 2012 Report Share Posted August 4, 2012 Let's hope he's not using a 1975 Holley -- it'll be worn out too like your 1975 Datsun carburetor. Quote Link to comment
jozefaz Posted August 6, 2012 Author Report Share Posted August 6, 2012 1976 l20b the holley is a 4776 list (600cfm, NOT 650cfm) 2 corner idle. secondary vent and fuel inlet plugged essentially i am running a carb smaller than a 2300 american SSS exhaust manifold with smog ports plugged ( or so i was told it was SSS, he said the jap version didn't have smog ports) installed a crankcase evac so no pcv valve. works awesome. jetting is out of the box stock, haven't hooked up the wideband to change the main jets. idle is awesome, way better than the stock Hitachi was. even better than my old single 40dcoe was as well. have the stock exhaust resonator in place till i can afford to remove it, so its choking the engine, hence the secondaries wired shut. accell HEI module in aluminum sealed enclosure that acts as the heatsink hooked to a oem magnetic pickup distributor. msd blaster 2 coil. intake stuff is all off the self spectre stuff from oreillys / summit racing. nothing trick about. just welded the appropriate angled tubing from 4inch exhaust steel tubing. funnel - http://www.summitracing.com/parts/SPE-9789/ inline air filter - http://www.summitracing.com/parts/SPE-9831/ carb hat - http://www.summitracing.com/parts/SPE-9849/ used a solid rod of stainless for the linkage and used a threaded female ball stud from the end of a trunk lift support for the pedal and the spherical rod end for the carb side. this is a video i did before i even adjusted the idle mix or speed, and it had a vacuum leak at the time . i have since foudn and sealed it... throttle response sounds crappy but its actually very crisp. fan clutches suuuuck.... <iframe width="560" height="315" src="http://www.youtube.com/embed/c-73nSZ_A4w" frameborder="0" allowfullscreen></iframe> Quote Link to comment
ggzilla Posted August 6, 2012 Report Share Posted August 6, 2012 Sounds good, looks great. Holley 2300 is 270 CFM (193 CFM equivalent to 4-bbl style rating) Holley 600 is 600 CFM, correct? So 1/2 would be 300 CFM? Quote Link to comment
datsundash Posted August 6, 2012 Report Share Posted August 6, 2012 Looks cool, Kinda big and bulky though. Mikunis would have been more nostalgic. I bet you afr is through the roof, plugs are probably black. Quote Link to comment
datzenmike Posted August 6, 2012 Report Share Posted August 6, 2012 I remember the 'Dual Plane' Offys back in the day. Now it may mean something different today but... The runners were split lengthwise with a smaller roughly D shaped upper and a much larger D shaped lower half. The uppers were all fed by the primary or primaries in the case of a 4 bbl. The secondaries were fed through the bottom larger port. In theory the smaller port kept the primary air moving faster than in a huge port for quick throttle response with high overlap cams. The secondary was larger for full throttle. The theory may work for the manifold but the smaller port dumps into the large port at the head and much of the velocity is lost. I never cared for them. Quote Link to comment
jrock4224 Posted August 6, 2012 Report Share Posted August 6, 2012 i think i am storing a old four barrel mani for a datsun for phixius.....seem to remember scratching my head at it for a while.. Quote Link to comment
datzenmike Posted August 6, 2012 Report Share Posted August 6, 2012 Get an oic of the runner ports. Quote Link to comment
jozefaz Posted August 9, 2012 Author Report Share Posted August 9, 2012 http://www.holley.com/types/Two%20Barrel%20Street.asp Quote Link to comment
jozefaz Posted August 9, 2012 Author Report Share Posted August 9, 2012 i dont have any pictures straight on showing the divider, but yes, the runners are different sizes. the plenum on the engine side are smaller runners to keep velocity up ont he primary barrels and the master cylinder side plenum is larger runners. i had to create and waterjet out that new aluminum plate to rotate the carb 90 degrees to kept the linkage inline and fuel bowels not hit the valve cover. so the dual plenum doesnt really work for me but it runs and idles great regardless... as far as black plugs not sure. havnt hooked the wideband back up to check the jetting but setting the idle mix and speed by vacuum has given great results. Quote Link to comment
Dawa Posted April 17, 2013 Report Share Posted April 17, 2013 resurrection bump because sexy Quote Link to comment
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