Info on factory 4v intake manifolds?

[Mercracer]

I have a bit more than 150 hp engine in my case. Dont think i have been refering to any builds that have only the ability to put out 1150 hp. Put your money up and knowlege againts the shop car at milan drag way any time. Tired of your naysayer ways

We are talking about different things. I am responding to Scott's question about a good EFI intake for ported E7 heads. An unported Explorer or Cobra upper and lower can support over 350HP. The Factory Stock guys have been doing it for years. I am not talking about a 1000HP motor......
Scott isn't involved in a 1000HP build right now. I brought up the 150HP just as an example that more flow isn't going to make more HP is your motor doesn't need it.
I know Scott already has an Explorer intake. He doesn't have anything to gain by paying more money for a ported lopo lower when he already has a complete Explorer intake.

I am not talking about your combo and I am not even going to guess why you are starving for fuel......

[1987cp]

Actually, I *was* going to say something about the threadjacking by way of talk about injected intakes, but eavesdropping two guys who know more than I do is too educational to do that! Besides, you're both admins, and I'm not. Banter on!!

[Mercracer]

My Bad.....

Scott asked a question and I put in my 2C.

We are talking tech though......

[turbo2256b]

somewhat my bad too. Scott did ask about a lopo with ported E7 heads. The BHP ported heads have a big increase in air flow at even the lift of a lopo cam. Many intakes are still going to need port work to match the air flow. Whats the lift on a lopo?

[1987cp]

lowpo lift .... isn't that the one spec'd in the Haynes manual? Or is that for the older non-roller lowpo? In any event, it's tiny. I do have my old lowpo cam out in the garage, but I don't currently have a way to measure it. .......... I wonder if this is a good excuse to buy a cheapie digital caliper ........ :waiting:

[turbo2256b]

LOPO LIFT .377 .... With BHP flow figures it puts you around 200 CFM with all the proper parts it would be possible to attain 400 HP @ 5900 RPM.

With a manifold only flowing 170 CFM the HP would be cut down to 350 @ 5000 RPM with the proper mating parts.

[1987cp]

Wow, tiny cam. Anyone know the duration?

I keep forgetting ... what size valves do you guys use on the BHP heads, or does it vary per customer specification?

[turbo2256b]

Wow, tiny cam. Anyone know the duration?

I keep forgetting ... what size valves do you guys use on the BHP heads, or does it vary per customer specification?

either rstock reworke valves or 1.9 / 1.6

[Nathan in MI]

lowpo lift .... isn't that the one spec'd in the Haynes manual? Or is that for the older non-roller lowpo? In any event, it's tiny. I do have my old lowpo cam out in the garage, but I don't currently have a way to measure it. .......... I wonder if this is a good excuse to buy a cheapie digital caliper ........ :waiting:

You can't measure camshaft lift with a caliper, silly!

[turbo2256b]

You can't measure camshaft lift with a caliper, silly!

Some you can real mild ones or if you know the base circle.

[OVERKILL]

You can't measure camshaft lift with a caliper, silly!

Sure you can. Measure base-circle on the sides of the lobe, then measure from the peak of the lobe to the back-side. Then subtract the first measurement from the 2nd measurement, multiply it by 1.6 and you have valve lift, which you could compare to say the HO cam's lift, which is .444. This is assuming stock rocker ratio, which is 1.6.

[1987cp]

Some you can real mild ones or if you know the base circle.

I was about to ask why you couldn't measure some cams this way, but then I realized that if it's too fat you can't get an accurate base-circle measurement with a caliper and the best solution would be to stick it in a block and use a dial indicator. And then you can use a degree wheel and directly measure the duration as well!

(sorry, I'm still kind of a n00b engine builder and have yet to actually degree a cam) :p

[Nathan in MI]

Sure you can. Measure base-circle on the sides of the lobe, then measure from the peak of the lobe to the back-side. Then subtract the first measurement from the 2nd measurement, multiply it by 1.6 and you have valve lift, which you could compare to say the HO cam's lift, which is .444. This is assuming stock rocker ratio, which is 1.6.

Yeah, I guess you could do that. Just seems like a rather approximate method--if you really want to know I'd tend to think the best bet would be a dial indicator and a degree wheel, as Michael said.

[turbo2256b]

You can not always measure the base circle on cams the hoter cams ramps will blend past the 180* needed to measure accross a circle. A dial idicator or knowlege of what the base circle is then required.

[OVERKILL]

You can not always measure the base circle on cams the hoter cams ramps will blend past the 180* needed to measure accross a circle. A dial idicator or knowlege of what the base circle is then required.

True, and some of the cams go PAST "closed" on the very back-side of the lobe as well. But we are talking about a stock LOPO camshaft here, which is why I mentioned the method I did. A better method (as opposed to using calipers) of course would be to use a Micrometer. The local machine shop has a box of mics of various sizes, which I borrowed to measure my home made "adjustable pushrod" so I could determine the correct pushrod length for my engine when I was doing the top-end.

The dial-indicator method works very well, and was how I confirmed how my cam was installed on the Capri. This of course assumes that you have the camshaft in the engine though.