Crownin_Round Posted March 26, 2012 Share Posted March 26, 2012 Update question time Anyone know if a choke for a dhla will wit a drla? looking at some carbs for a project and I dont know squat about brands, ive had a browse on google and just as many people have opinions on either product I have re searched so I thought fuck it ill make a post and abuse some band width, Now bearing in mind this is a "maori" project these are what I have come across http://www.trademe.co.nz/Browse/Listing ... ermanent=0 and http://www.trademe.co.nz/motors/car-par ... 552321.htm From what I could find out the webbers are better for top end fueling and they are simpler and better parts availability and that the dellortos have better fueling across the rev range but also are not to dificult to rebuild. The engine I plan to use these on is my 5mge and I will be running 3, the user also has listings for 40mm items but I didnt really wanna go to large will 3 36mm be enough after I re jet them? manifolds are not a problem at this stage any input greatly appreciatted Quote Link to comment Share on other sites More sharing options...
phatt20 Posted March 26, 2012 Share Posted March 26, 2012 any of those carbs will be sweet if tuned/rejetted to suit. any reason you wanting downdrafts instead of side drafts? got enuf bonnet cleareance etc? always wanted to carb a 5mge, will be a mean upgrade over the shitty factory injection i reckon. Quote Link to comment Share on other sites More sharing options...
Testament Posted March 26, 2012 Share Posted March 26, 2012 the DRLA are supposed to have better progression than the IDF's are pretty prone to have a bit of a flat spot alledgedly, nothing that would matter for a budget setup though. have you worked out what size chokes you need agains the factory weber sizing graphs? i.e. workout airflow per cylinder and you can determine choke size for an assumed VE once you know that you can work out if 36's or 40's will be the go (better to have a smaller choke in a bigger carb than the choke very close to the carb size - within reason) Quote Link to comment Share on other sites More sharing options...
bosozoku_gx71 Posted March 26, 2012 Share Posted March 26, 2012 Ive got nothing to contribute except you need making a project thread for this cause thats a sweet idea and im SOOOO keen to hear this on full noise. Heaps as of fun. As you were. Quote Link to comment Share on other sites More sharing options...
EvoBilly Posted March 26, 2012 Share Posted March 26, 2012 i don't really know much bout carbs but seen alot of people talking bout bike carbs could they be a option? Quote Link to comment Share on other sites More sharing options...
Crownin_Round Posted March 27, 2012 Author Share Posted March 27, 2012 any of those carbs will be sweet if tuned/rejetted to suit. any reason you wanting downdrafts instead of side drafts? got enuf bonnet cleareance etc? always wanted to carb a 5mge, will be a mean upgrade over the shitty factory injection i reckon. Just price and ease of use atm who cares about bonnet clearance ae lol the DRLA are supposed to have better progression than the IDF's are pretty prone to have a bit of a flat spot alledgedly, nothing that would matter for a budget setup though.have you worked out what size chokes you need agains the factory weber sizing graphs? i.e. workout airflow per cylinder and you can determine choke size for an assumed VE once you know that you can work out if 36's or 40's will be the go (better to have a smaller choke in a bigger carb than the choke very close to the carb size - within reason) From what I can ascertain from google'ing 36mm will be enough for the 5mg rev range I will just get re jetted to suit, I dont know about bike carbs havent looked into the science of that but I can only guess it will be a cunt to make a hi revving carb work on a low revving engine but yeah sooner stick to car carbs although I was looking at something like these http://www.trademe.co.nz/motors/motorbi ... 456725.htm but they look rubbish but there are similar ones that look better Quote Link to comment Share on other sites More sharing options...
phatt20 Posted March 27, 2012 Share Posted March 27, 2012 bike carbs are good on 4cyls being as most bikes that have them are four cyl, but would be a bit of a cunt to set up on a 6 , unless you maybe got two sets of triples off a triumph or similar? but yeah, if budget is the key you really want to get some weber/delortos off something with a similar sized capacity per cyl to help reduce the amount of fucking round with jets. by the time you have bought jets for 6 barrels it gets expensive. Quote Link to comment Share on other sites More sharing options...
Snoozin Posted March 27, 2012 Share Posted March 27, 2012 Considered a set of triple SU's at all? Dirt cheap and piss simple to set up. I reckon you'd get away with a trio of HS6's perhaps? Quote Link to comment Share on other sites More sharing options...
Testament Posted March 28, 2012 Share Posted March 28, 2012 no carb is inherently "high revving" all a carb does is meter fuel to air +/- a few other factors depending on the carb to make for smooth running through speed/rev/throttle transitions. a big engine turning slow and a small engine turning fast can have the same airflow requirements and would just need different idle/transition settings. whether it is a bike carb or a car carb or a boat carb or whatever. for bike carbs you could get two sets of four and just split one set to get six - depending on the throttle synchronisation arrangement. BUT the original question was about twin throat equal opening weber/dellorto downdraft carbs. chart I was refering to is something like this one below. although not sure what VE this chart is assuming but 85% is the usual guess for 2 valve engines (i think the 5mg is 2 valve?) and 2.8L yes? so ~467cc cylinders so according to that chart you should be looking for about 36mm Venturis - so those 36DRLA or 36IDF carbs will unfortunately be too small and will probably strangle power above 5000rpm, and thats presuming you get max size chokes for a 36mm carb (probably 32mm chokes). Thats not saying it wont work at all but it will be alot of money and work for a much less than ideal setup. really 40's with 34mm chokes or 44 or 45 carbs with 34mm or 36mm chokes would be best. Quote Link to comment Share on other sites More sharing options...
Crownin_Round Posted March 28, 2012 Author Share Posted March 28, 2012 So if 36mm does not refer to the choke size then how do you know what the choke size is? And SU's are non existant Quote Link to comment Share on other sites More sharing options...
Testament Posted March 28, 2012 Share Posted March 28, 2012 ask the seller? or if you are looking at them in the metal look down the carb and it will usually be stamped/cast into the edge of the choke itself. final straw would be to use to inside calipers to physically measure it. su's non existant? http://www.trademe.co.nz/motors/car-par ... 653557.htm or look at pick a part. might have to search around/buy a couple of pairs if you want to run triples like they do on jag motors sometimes (you wouldnt run 6x SU's, just 2x or 3x) also I doubt there are manifolds available for SU's to a 5mg. or IDF's to 5MG for that matter. you could probably find DCOE's to 5mg with some searching I would guess as they are the most common performance webers to use on anything. Quote Link to comment Share on other sites More sharing options...
Crownin_Round Posted March 28, 2012 Author Share Posted March 28, 2012 very helpfull as for the su's I was meaning in a triple set but manifolds are no problem I have custom fab options Quote Link to comment Share on other sites More sharing options...
Jase Posted March 29, 2012 Share Posted March 29, 2012 if you have patience a tig a mill and $50 i have some carbs for you, they're off a v6 220hp johnson i believe as you can see they run a main ali body that would need parting and a central shaft that would need disecting, all six carbs are present oh yeah they be sidedraft though Quote Link to comment Share on other sites More sharing options...
MoparOrNoCar Posted March 29, 2012 Share Posted March 29, 2012 Dude, I got triple 48mm Dellortos on me Charger, the key is not the carb, its havin a really good analogue vacuum gauge to balance them. I pull nearly 1200 cfm at full welly boot and it eats Skylines for lunch. Port match yer head to exhaust and inlet then bench flow it, then choose the carbs. You will have the ugliest but coolest Wagon in the world. Any Reconnditioner or head specialist can do this for not much, love the idea. Quote Link to comment Share on other sites More sharing options...
Testament Posted March 29, 2012 Share Posted March 29, 2012 Port match yer head to exhaust and inlet then bench flow it, then choose the carbs. You will have the ugliest but coolest Wagon in the world. Any Reconnditioner or head specialist can do this for not much yes port matching is worthwhile, if you have the head off and probably wouldnt cost too much or is easy enough to do yourself if you feel inclined. but getting a head flowbench ported is not cheap at all! and alot of reconditioners would not have a flow bench - and often (unless you "know the guy") those would be shops doing race engines and charge an arm and a leg because its "race engine work" thats my first hand experience at least. knowing the flowrate would be useful and can help you optimize choke size a bit - although you could figure the same thing out in practice once the engine is running including other factors such as exhaust setup which are not accounted for on the flow bench. Quote Link to comment Share on other sites More sharing options...
RUNAMUCK Posted March 30, 2012 Share Posted March 30, 2012 I know a bloke who has quite a few SU's. If you were interested exploring the SU route, go see Daryl at Economy Auto repairs. He's dismantled quite a few triumphs. So he has a good collection of SU's and strombergs. I've often fantasized about running three 1.75's on a chrysler slant 6. Daryl is pretty good at making them run right too. He gave my old datto a tickle up and it sang. I'd expect youd be able to buy a trio of carbs, and get them on and running cheaper than just buying the carbs if you went for the weber option. Quote Link to comment Share on other sites More sharing options...
Valiant Posted March 30, 2012 Share Posted March 30, 2012 I've often fantasized about running three 1.75's on a chrysler slant 6. Me too. Keep in mind that Weber and Dellorto parts are expensive to buy and you will need to buy them X6. Either way I like the idea. Quote Link to comment Share on other sites More sharing options...
Crownin_Round Posted March 31, 2012 Author Share Posted March 31, 2012 damn http://www.trademe.co.nz/motors/car-par ... 821522.htm Quote Link to comment Share on other sites More sharing options...
RUNAMUCK Posted March 31, 2012 Share Posted March 31, 2012 Like I say, for what you could expect to pay for the parts alone, you couls SU that shit had have beer money left over. Quote Link to comment Share on other sites More sharing options...
Crownin_Round Posted April 1, 2012 Author Share Posted April 1, 2012 oh I wasnt damn'n at price I was damn'n coz they are the business lol And Yea Im going to look into this SU thing but they just dont look as cool haha jj Im just looking for a good cheap alt ill consider anything was even thinking 3 2k carbs... seems legit Quote Link to comment Share on other sites More sharing options...
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