Anyone Dyno Gains to a ported stock intake manifold on a bolton car?
12-15-2007, 11:33 AM
#41
TECH Junkie
Thread Starter
slick, the intake/TB swap was done with no extra tuning. Just swap and go.
Best way to get an idea about what intakes are restrictions on each engine will be to measure the restrictioin points in the intake manifold and compare it to the restriction areas in the heads.
The 5.0 ford intake is MUCH smaller than the min cross section of the intake port on the heads. This is why a ported 5.0 intake will help ANY 5.0 from bone stock to a heads/cam set up.
The LT1 intake at its restrictive point (minimum cross section) is actually larger than the unported LT1 cylinder head at the pushrod pinch. No reason to make the intake larger until the heads are ported and making the intake manifold smaller than the heads restrictive point.
Once the heads are ported, you can actually see some gain from the intake portwork if everything else is moving enough air (CAI, 58 MM TB, 1 3/4 or 1 7/8 headers, 3" true duals, etc, cam with enough overlap and duration to need the flow, spinning enough RPM, etc).
If using a stock TB, small or emissions type cam with no overlap, 1 5/8 headers thru cats and a cat back exhaust, you are never gonna make the intake be the restriction due to these other "high velocity" products.
Even on the right set up with all the good mods making 400 RWHP, you will see NOTHING below 3000 RPM since the stock intake can still feed the set up. You will slowly start seeing HP gains 5 HP by 4500 RPM, 8-10 HP at 5500-6000 RPM and 10-12 HP above 6200 RPM.
As you can see, the only way the ported intake will help you at the track is IF you have all the free flowing parts, the right head and cam set up to see the 10-12 HP gain AND are keeping the engine in the 6000-6500 RPM range to actually see the benefits.
I would chose an electric water pump over a ported intake for most people since the gains are more of a guarantee on any set up with any heads, cam, exhaust, etc and evryone will see some gains at the track with an electric water pump.
Lloyd
Best way to get an idea about what intakes are restrictions on each engine will be to measure the restrictioin points in the intake manifold and compare it to the restriction areas in the heads.
The 5.0 ford intake is MUCH smaller than the min cross section of the intake port on the heads. This is why a ported 5.0 intake will help ANY 5.0 from bone stock to a heads/cam set up.
The LT1 intake at its restrictive point (minimum cross section) is actually larger than the unported LT1 cylinder head at the pushrod pinch. No reason to make the intake larger until the heads are ported and making the intake manifold smaller than the heads restrictive point.
Once the heads are ported, you can actually see some gain from the intake portwork if everything else is moving enough air (CAI, 58 MM TB, 1 3/4 or 1 7/8 headers, 3" true duals, etc, cam with enough overlap and duration to need the flow, spinning enough RPM, etc).
If using a stock TB, small or emissions type cam with no overlap, 1 5/8 headers thru cats and a cat back exhaust, you are never gonna make the intake be the restriction due to these other "high velocity" products.
Even on the right set up with all the good mods making 400 RWHP, you will see NOTHING below 3000 RPM since the stock intake can still feed the set up. You will slowly start seeing HP gains 5 HP by 4500 RPM, 8-10 HP at 5500-6000 RPM and 10-12 HP above 6200 RPM.
As you can see, the only way the ported intake will help you at the track is IF you have all the free flowing parts, the right head and cam set up to see the 10-12 HP gain AND are keeping the engine in the 6000-6500 RPM range to actually see the benefits.
I would chose an electric water pump over a ported intake for most people since the gains are more of a guarantee on any set up with any heads, cam, exhaust, etc and evryone will see some gains at the track with an electric water pump.
Lloyd
Great info, thats what I was looking for thank you so much for taking time to post
