Guest agentc73 Posted August 26, 2008 Share Posted August 26, 2008 I tried to search, and found plenty of threads on the carbs, but not the intakes. I just purchased a nice Mikuni 40MM side draft set up, with an un-ported, short runner Mikuni Intake. I have an offer to trade for a Datsun Motorsports Intake, but wanted to ask advice from those who KNOW, before I commit to anything. My question is: Which one would be better for a HOT street 2.8L(for now, 1st L6 build)? Target Compression is @ 10-1. I think am going with a fairly stock N42 head. Mild porting. Mild(ish) aftermarket cam, using mostly stock parts. Probably buying springs, and pistons(and ?). Just want a little lope for now. Which Intake would be best for my application? Why? Ty! Ty! TY! Quote Link to comment Share on other sites More sharing options...
yo2001 Posted August 26, 2008 Share Posted August 26, 2008 If you go with a hot cam, I would think think you'll need 44mm's. Mikuni intake looks pretty good IMO. You might get little more torque if it was longer. My setup which came off an ITS car got 44's L9 cam (290 duration) and 10.5:1 comp. The powerband was aimed between 3500-7000rpm. Quote Link to comment Share on other sites More sharing options...
Guest agentc73 Posted August 27, 2008 Share Posted August 27, 2008 Thank you for your reply! From what I've read here, it seems the general consensus is 40's are fine for hot street/canyon carving. I'm sure bigger carbs COULD work VERY WELL, but I'm not expecting huge HP numbers, esp. at the expense of very much off idle smooth RPM's. I feel have too much to learn about Mikuni's to try and go "Pro" yet. ]And I want my curve to start lower than yours, I believe. This will be a TRUE everyday daily driver, not something I play with for an hour once a month. I do plan on having the carbs tuned professionally, initially, when the car is operable. I'll take it from there. Plus, I got a good price+trade for 'em. Don't think I'd ever want to pay for what I've seen 44's go for, myself. So. Intakes...? The PM's say keep the Mikuni. Any other advice/input/opinions/experience, anyone? Quote Link to comment Share on other sites More sharing options...
JMortensen Posted August 27, 2008 Share Posted August 27, 2008 Nissan Comp. If Nissan went to the trouble to make their own manifold, there is probably a reason. Rebello told me that using a Cannon instead of a Mikuni manifold was a good move when I asked them 7 or 8 years ago. I'd suggest 44's as well. Quote Link to comment Share on other sites More sharing options...
Guest agentc73 Posted August 27, 2008 Share Posted August 27, 2008 Hmmn. And they meant a street application as well? Still can't afford 44's.I'm starting completely from scratch here. I have a LOT to buy, and have these for now. Maybe in a few years, or something. The tally is Datsun MS 2 Mikuni 2 (via PM) I have also hear that the Cannon is nearly identical to the DMS Intake. Any truth to that, guys? Quote Link to comment Share on other sites More sharing options...
JMortensen Posted August 27, 2008 Share Posted August 27, 2008 And they meant a street application as well? If you go by the old (not necessarily true) rule of thumb, the Nissan Comp has longer runners, which should give more low end. I have also hear that the Cannon is nearly identical to the DMS Intake.Any truth to that, guys? No. The Nissan Comp is a much better quality casting than the Cannon, length is in between the Cannon and the Mikuni, and it has probably the best most gentle bends in the manifold of any of them. The Nissan Comp carb insulators are also supposedly much better than the Mikuni pieces, if you can find them. Quote Link to comment Share on other sites More sharing options...
Guest agentc73 Posted August 28, 2008 Share Posted August 28, 2008 If you go by the old (not necessarily true) rule of thumb, the Nissan Comp has longer runners, which should give more low end.No. The Nissan Comp is a much better quality casting than the Cannon, length is in between the Cannon and the Mikuni, and it has probably the best most gentle bends in the manifold of any of them. The Nissan Comp carb insulators are also supposedly much better than the Mikuni pieces, if you can find them. I've read in a book (How to Build Horsepower, Vol. II, by David Vizard) the reason might be that considering TOTAL length of the runner+carb+stacks/horns, the longer, the lower the power band. Can't remember the formula. If your Intake is longer, it's supposed to lower the power peak. If you have a short runner Intake, longer stacks would in theory have the same effect. Better casting as well. Gentle bends. That's appealing. Hmmn. Insulators are much better? Why are they "better"? More efficient at isolating the carbs from heat, or...? Are those the ones that I've read are made of asbestos, or something to that effect? Quote Link to comment Share on other sites More sharing options...
JMortensen Posted August 28, 2008 Share Posted August 28, 2008 The Mikuni ones are asbestos. The Nissan Comp are rubber and about 2x as thick. They do a better job of insulating from heat and also handle a bit of vibration as well or so I'm told. Quote Link to comment Share on other sites More sharing options...
Guest agentc73 Posted August 28, 2008 Share Posted August 28, 2008 The Mikuni ones are asbestos. The Nissan Comp are rubber and about 2x as thick. They do a better job of insulating from heat and also handle a bit of vibration as well or so I'm told. Yuk. I'm glad I heard about that, before I took them off. Or licked my intake. Fuel "Resistant(or whatever the term is for fuel hose material)" Rubber? 2 X as thick? I'll keep that in mind. Sounds reasonable... ty, Boss What other side draft Intakes might be out there? What RPM's do they work best? What are the engine and cam specs? Length of the Stacks? What shape? I'm curious, and would love to see pics... Any old 70's/80's pieces? Modern stuff? Quote Link to comment Share on other sites More sharing options...
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