Alphabettispaghetti
Club Member
I have run open trumpets on this car for some time now. This is the new setup I started test fitting today.
steering rack is going to make a right mess of your battery
I have run open trumpets on this car for some time now. This is the new setup I started test fitting today.
Open trumpets on several cars over many years here. Only had problems with foreign bodies getting into them when a bunch of 'bright sparks' (ie dim knuckledraggers...) decided to stuff crisp packets, old leaves and handfuls of turf into them at a Z Club-organised meeting.
So, leaving your bonnet open at a car show might actually be more risky than open trumpets per se.
I think the expression on the street* is 'Haters Gonna Hate'...
*one for the teenagers there.
You’ve lost me frankly?
I do recall the PMAC / Skidell dream team doing a list of rolling road work on this topic and it transpired that open trumpets suffered with reflected waves off the side of the engine bay. If I recall they said the late Mr F style air box was the best way forward for power.
here's a quick analysis of those 70's rebound waves....
albeit a very non-scientific one...
Analysis readout:
Cylinder 1 = 0.0008% power reduction due to proximity of fuel filter.
Cylinder 2 = 0.01% power reduction due to proximity of strut tower.
Cylinder 3 = Ditto.
Cylinder 4 = Full power on every second Saturday of the month!
Cylinder 5 = Ditto.
Cylinder 6 = Oh dear, it's the clutch master cylinder...
I ran open 75mm trumpets on my twin SUs and the car ran better than with the OEM airbox but that is orange so perhaps it was the wrong colour.
I bought a couple of trumpet filters from the US to fit to the front (see pic) and have not had any problems. However I have now switched to K&N deep filters and will be dropping smaller trumpets inside. I am very risk averse when it comes to my car so that is why I switched.
Caution with Foam...heard horror stories of parts of them being sucked in and in worse cases they are a catalyst for fires through carb spit backs etc.
Is that the type that was warned about here?