Honda intake manifold
#201
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True. But with the thing braced and good couplers, thats pretty unlikely. For it to come off it has to blow not one but all the couplers and overcome the bracing. If you do the bracing right, that means you need enough force to straight overcome the tensile strength of several peices of steel straping. If you have that kind of force, you are running diesel truck levels of boost and/or a large animal has been ramed into your engine bay and you are dead.
Lets say it does come off (which will be under boost if it happens) you will have a massive and sudden drop in the amount of air going into the head at first as boost just evacuates the intake. The engine is now pig rich and beyond for a short moment. Driver lets off the throttle with with the scary noise/feeling. Now you have basically ambient pressure on the MAP sensor. You do also have an engine getting airflow at ambient levels, but little or no fuel. So you will be lean or it will simply die for lack of fuel depending on where the injectors are. A 1.6 would likely be getting plenty of fuel due to the location of the injectors after the couplers. A 1.8 would be anyones guess. What with vacuum though, most of the fuel is going to get sucked right into the head short of the kind of blow up outlined in paragraph 1.
Lets say it does not die. Worse, lets say the driver goes into neutral or just pushes in the clutch. ****, now we have air and fuel (ish) going in and no load! ZOMG! Except that it will just bounce off the limiter untill the driver wakes up and shuts it down. Limiters work on ignition, which is working just fine.
Short of being a complete fool and running like that under a possible lean condition for a long damn time, I dont see damage occuring there. Scary as all get out sure, but not catstrophic. The only way the engine is going to run lean is if there is little or no load and then only at ambient pressure and then only for a moment. It wont over-rev, or at least not beyond whatever you set your limit to.
Lets say it does come off (which will be under boost if it happens) you will have a massive and sudden drop in the amount of air going into the head at first as boost just evacuates the intake. The engine is now pig rich and beyond for a short moment. Driver lets off the throttle with with the scary noise/feeling. Now you have basically ambient pressure on the MAP sensor. You do also have an engine getting airflow at ambient levels, but little or no fuel. So you will be lean or it will simply die for lack of fuel depending on where the injectors are. A 1.6 would likely be getting plenty of fuel due to the location of the injectors after the couplers. A 1.8 would be anyones guess. What with vacuum though, most of the fuel is going to get sucked right into the head short of the kind of blow up outlined in paragraph 1.
Lets say it does not die. Worse, lets say the driver goes into neutral or just pushes in the clutch. ****, now we have air and fuel (ish) going in and no load! ZOMG! Except that it will just bounce off the limiter untill the driver wakes up and shuts it down. Limiters work on ignition, which is working just fine.
Short of being a complete fool and running like that under a possible lean condition for a long damn time, I dont see damage occuring there. Scary as all get out sure, but not catstrophic. The only way the engine is going to run lean is if there is little or no load and then only at ambient pressure and then only for a moment. It wont over-rev, or at least not beyond whatever you set your limit to.
#204
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Silicone Hose and Clamps
16" really strong coupler material (I used this on my own IC pipes @ 24 psig with 0 issues on a DD and that dealt with more movement than this will) - $16
16" really strong coupler material (I used this on my own IC pipes @ 24 psig with 0 issues on a DD and that dealt with more movement than this will) - $16
lol
Anyone have a pic of a cut 1.6 manifold?
#209
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I'm going to shoot a little closer to 9-10". The Skunk2 is designed to make power up to 8K+...and the Blox runners are even shorter. I don't plan on overspinning mine, and some crude interpolation of runner lengths versus powerbands tells me they should be a good bit longer to make the power from 5000-7000 we're looking for.
I'll stop posting in this thread until I'm ready to put up pictures of hardware.
#214
Boost Czar
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yes, but my pretty much blew on the dyno and it wasnt boosting correctly
![](http://www.boostedmiata.com/gallery2/d/4808-2/intakemanifold_boost_compare.jpg)
you gotta take the boost plots into consideration. I did make more power up top with less boost at the same timing.
here's how it compared at wastegate levels:
![](http://www.boostedmiata.com/gallery2/d/4812-1/intakemanifold_compare_wastegate.jpg)
again, my motor was not up to snuff. I ultimately sold the IM to pay for a new block and parts.
![](http://www.boostedmiata.com/gallery2/d/4808-2/intakemanifold_boost_compare.jpg)
you gotta take the boost plots into consideration. I did make more power up top with less boost at the same timing.
here's how it compared at wastegate levels:
![](http://www.boostedmiata.com/gallery2/d/4812-1/intakemanifold_compare_wastegate.jpg)
again, my motor was not up to snuff. I ultimately sold the IM to pay for a new block and parts.
#215
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so what happened to that manifold? looks like it had plenty of potential
#220
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He may be addressing the fact that the runners almost exactly match the BP flange, but not the B6.
Still, we've been over it several times in this thread...cut the 1.6L mani 3" back from flange, and cut the Honda mani where the runners converge.
I'll let you know exactly how far back that is when I get it done. Gotta swap shocks again before I can get to it though.
Still, we've been over it several times in this thread...cut the 1.6L mani 3" back from flange, and cut the Honda mani where the runners converge.
I'll let you know exactly how far back that is when I get it done. Gotta swap shocks again before I can get to it though.