Honda intake manifold
03-11-2016, 12:07 PM
#964
Like I have stated earlier, based on testing and observations here, the shorter runners pay off with cams that have enough duration to move torque and power peaks up 1000~1500rpm. Stock-ish cams I still believe OEM runner lengths give the best area.
Our best ever area with a square top, 182whp was with stock NB2 cams on 11.0:1 2.0L with everything coated on pump gas. We never raced in this config as it was over our power cap. A CNC +2 head would have brought that to about 192whp I think. We have an engine going together now that should get close to 185whp on pump gas with a squaretop.
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03-11-2016, 12:10 PM
#965
Any peak values? VICS manifold wins the area under the curve battle and is what I would race on. Likely further small gains with multiple and tuned VICS crossovers points.
Like I have stated earlier, based on testing and observations here, the shorter runners pay off with cams that have enough duration to move torque and power peaks up 1000~1500rpm. Stock-ish cams I still believe OEM runner lengths give the best area.
Like I have stated earlier, based on testing and observations here, the shorter runners pay off with cams that have enough duration to move torque and power peaks up 1000~1500rpm. Stock-ish cams I still believe OEM runner lengths give the best area.
We are trying to figure out how this car's sister with an identical setup save for added timing and 5A cam is making 10-15 more torque everywhere and 10-12 more peak hp than me.
With a bigger cam and more timing, this car should make more than the other car, but it is the opposite.
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03-14-2016, 06:55 PM
#966
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pretty sure the VICS manifold has the longest runners of any of the NB versions. it appears the runner length extends further into the top half of the manifold than either the VTCS manifold or the flat top. It might be approaching the Protégé VICS BP manifold length that made 12hp and 8 ft-lbs over the same motor specs in a NA Miata.
Seems like those long runners are making mid range area under the curve.
Seems like those long runners are making mid range area under the curve.
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07-05-2016, 11:00 PM
#967
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Random postmortem update on my redrilled Blox skunk2 copy:
all four runners had cracked at the flange. Two flange nubs broke off completely. The top middle stud was broken, no lower studs broke.
Motor was a balanced/forged bottom end with a 949 damper/BE pump, 1 Mazdacomp mount, 1 OE mount, unsprung 3 puck SPEC clutch.
all four runners had cracked at the flange. Two flange nubs broke off completely. The top middle stud was broken, no lower studs broke.
Motor was a balanced/forged bottom end with a 949 damper/BE pump, 1 Mazdacomp mount, 1 OE mount, unsprung 3 puck SPEC clutch.
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07-06-2016, 11:30 AM
#975
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That plenty of people have run BP's to high RPMs with stiff mounts and haven't broken intake manifolds.
I don't believe psyber should reconsider stiff engine mounts because someone running a knockoff honda manifold broke theirs. Apples to Oranges.
I don't believe psyber should reconsider stiff engine mounts because someone running a knockoff honda manifold broke theirs. Apples to Oranges.
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07-06-2016, 11:31 AM
#976
There are a LOT of people that cracked custom or fabricated manifolds. Like, WAY more than I'd be comfortable seeing if I was considering a custom IM.
Maybe apples to oranges, but I'm still most comfy with the way the flattop is actually designed to work with the BP and would take every precaution if running a custom setup.
Maybe apples to oranges, but I'm still most comfy with the way the flattop is actually designed to work with the BP and would take every precaution if running a custom setup.
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