Exhaust Camshafts.
- Thread starter Bluezone
- Start date
Disclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. If you click them and make a purchase, we may earn a small commission.
As a LONG time owner of SVOs, I can tell you that the SVO was a "turned-up" version of the Lima motor. The TC, XR4ti, GT Turbo, etc. all had the same engine. The SVO was the first to gain an intercooler and the large VAM, but the internals were the same. Many SVO owners actually swapped the ECM from at 87/88 TC for smoother idle and better power.
Anyway, this has nothing to do with this thread so I'll drop it.
Bluezone
Tailgaters will be prosecuted.
Pontiac did something similar to detune. In their case it was the firebird and the GTO.
Pontiac - GTO more better car.
Same engines used, but the Firebird had a movement restrictor on the secondary throttles of the four barrel. This limited the horsepower output by limiting total air flow.
Bluezone
Tailgaters will be prosecuted.
I wonder what these could be?
Looks like the published n a camshaft specs are correct. No idea how many miles are on these. But they're actually ever so slightly above spec.
Yes I got a project for the weekend, trying to figure out the duration and timing. Anyone have a set of EcoBoost exhaust camshafts that they can do Precision measurement on?
Rear wheel drive Kelford cam specs for EcoBoost.
Looks like the published n a camshaft specs are correct. No idea how many miles are on these. But they're actually ever so slightly above spec.
Yes I got a project for the weekend, trying to figure out the duration and timing. Anyone have a set of EcoBoost exhaust camshafts that they can do Precision measurement on?
Rear wheel drive Kelford cam specs for EcoBoost.
Last edited:
802SHO
Stock Cams
Would love to have some stage 2 cams
yaycandy
Aerospace Engineer
Yea literally detuned. Iirc only the svo had the “change the tune on the fly switch”. Regular to premium fuel switch. Flipped to premium is a world of difference. Those engines are bullet proof. Lots of fun times in an svo tuned to 100octane with a garrett 2560r.
Bluezone
Tailgaters will be prosecuted.
Watch this.
Bluezone
Tailgaters will be prosecuted.
Okay I did some rough measurements @ 1 mm lift and total cam duration at 1 mm lift which is roughly .039" opening lift, to make it comparable. +/_ a couple degs.
226° duration .368 max lift.
Pretty close to exactly halfway between stage 1 and Stage 2 Kelford cams on the exhaust. This looks good.
I need someone with Measuring equipment and access to a set of front wheel drive EcoBoost exhaust cams? I need the lobe Center and total lift measured. This in regard to top dead center. Anyone chime in I don't really want to pull my valve covers off just to check this. Anyone who whines, reminder no one else has stepped up. Smart ***** hold your replies. Time to get involved, put up or shut up guys.
226° duration .368 max lift.
Pretty close to exactly halfway between stage 1 and Stage 2 Kelford cams on the exhaust. This looks good.
I need someone with Measuring equipment and access to a set of front wheel drive EcoBoost exhaust cams? I need the lobe Center and total lift measured. This in regard to top dead center. Anyone chime in I don't really want to pull my valve covers off just to check this. Anyone who whines, reminder no one else has stepped up. Smart ***** hold your replies. Time to get involved, put up or shut up guys.
Last edited:
Bluezone
Tailgaters will be prosecuted.
Okay I have installed the normally aspirated exhaust cams in my mks. I'm still waiting on the delivery of the three bar map sensor. From what I can tell from a log with the stock tune, wastegate duty cycle and throttle duty cycle are both down. I assume this is to try to keep torque demand Within the stock torque parameters. Won't know anything for sure until I get out to the track with the new map sensor. From what I've seen so far though gas mileage seems to have improved slightly.
Bluezone
Tailgaters will be prosecuted.
This is the next experiment I'm trying. Regardless of whether or not the exhaust cams help.
Bluezone
Tailgaters will be prosecuted.
Enough said. 
Bluezone
Tailgaters will be prosecuted.
Little roughing in work today.
Last edited:
Bluezone
Tailgaters will be prosecuted.
Okay I got the new manifold fitted up. Total Runner length to the valve is roughly 16 in. I'm just adjusting to odds and ends right now to get everything working together correctly.
According to my figures they should peek out at around 6200 RPM. According to Auto Mafia racing, on the 3.7 with the turbocharger and slightly larger intake camshafts it is around 6,000 RPM for Peak.
About 2 inches shorter would be great for really revving out.
Why switch over to this particular manifold. Cuz the tune resonance allows more air flow at lower boost levels. So lower wastegate Duty cycle. One other thing to consider. Horsepower equals torque at RPM divided by 5252. The higher you Rev, the higher the horsepower. We are presently peaking out at around 5,000 rpm.
None of that actually really matters though. If you can hold torque production farther out in the Rev range. You can then raise the shift points. Gear ratios are torque multipliers. So the longer you can hold the lower gear ratio. The longer you're at the higher torque multiplication of that lower gear. This is all theoretical though until I get out to the track.
To get all this to work and fit in took a little bit of Ingenuity and careful selection of factory parts and other odds and ends.
Oh one more thing. These manifolds are only considered safe up to around 12 PSI. They are plastic.
According to my figures they should peek out at around 6200 RPM. According to Auto Mafia racing, on the 3.7 with the turbocharger and slightly larger intake camshafts it is around 6,000 RPM for Peak.About 2 inches shorter would be great for really revving out.
Why switch over to this particular manifold. Cuz the tune resonance allows more air flow at lower boost levels. So lower wastegate Duty cycle. One other thing to consider. Horsepower equals torque at RPM divided by 5252. The higher you Rev, the higher the horsepower. We are presently peaking out at around 5,000 rpm.
None of that actually really matters though. If you can hold torque production farther out in the Rev range. You can then raise the shift points. Gear ratios are torque multipliers. So the longer you can hold the lower gear ratio. The longer you're at the higher torque multiplication of that lower gear. This is all theoretical though until I get out to the track.
To get all this to work and fit in took a little bit of Ingenuity and careful selection of factory parts and other odds and ends.
Oh one more thing. These manifolds are only considered safe up to around 12 PSI. They are plastic.
Devin
3.Slow
Nice thread, following.
