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Search found 9181 matches

by F-BIRD'88
Wed Feb 01, 2023 4:02 am
Forum: Engine Tech
Topic: cam duration
Replies: 15
Views: 1332

Re: cam duration

Comp Cams Hyd Cam #CS 268AH-8 pn 12-319-4
can use 1.6 rockers to good effect.
268/276 222/226 @.050" 108 LSA 104in/112ex
.464"/.464" (1.5rr).
.495"/.495" (1.6rr)
by F-BIRD'88
Wed Feb 01, 2023 3:26 am
Forum: Engine Tech
Topic: 347 Street Cam
Replies: 37
Views: 743

Re: 347 Street Cam

https://i.ebayimg.com/images/g/Xt8AAOSwRYFjbrU3/s-l1600.jpg https://i.ebayimg.com/images/g/dBEAAOSwczljbrU4/s-l1600.jpg Least amount of injector firing angle difference required. This also equates to the least compromise in injector firing angle when a common injector firing angle and height is deci...
by F-BIRD'88
Wed Feb 01, 2023 1:46 am
Forum: Engine Tech
Topic: 347 Street Cam
Replies: 37
Views: 743

Re: 347 Street Cam

Honestly I'd rather swap cams than modify a dual plane manifold for EFI - you are looking at a decent amount of work, fabrication effort and cost to do so. The runners aren't the same height/ angle etc. Plus some porting to make it somewhat match the heads. No pain no gain. You could test evaluate ...
by F-BIRD'88
Wed Feb 01, 2023 1:38 am
Forum: Engine Tech
Topic: 347 Street Cam
Replies: 37
Views: 743

Re: 347 Street Cam

Question: What is the rated air flow cfm of your throttle body on your EFI system?
by F-BIRD'88
Wed Feb 01, 2023 1:09 am
Forum: Engine Tech
Topic: 347 Street Cam
Replies: 37
Views: 743

Re: 347 Street Cam

There are tons of variations on long runner EFI intakes for a Ford small Block. All are versions of a folded over tunnel Ram. Like the OEM factory EFI on the 5.0 L Mustangs. A Cross Ram manifold is a tunnel Ram where the runners are layed down. The runners can be various tuned resonance length. All ...
by F-BIRD'88
Tue Jan 31, 2023 9:47 pm
Forum: Engine Tech
Topic: 347 Street Cam
Replies: 37
Views: 743

Re: 347 Street Cam

My Dual plane intake choice for you to consider modding for EFI injectors and a MAP sensor/ divided carb spacer for this
Is Weiand Street Warrior # 8124WND. These are Weiand's latest design Mid Rise High perf Dual Plane intakes.
@ $228.00 retail its hard to go wrong.
by F-BIRD'88
Tue Jan 31, 2023 5:53 pm
Forum: Engine Tech
Topic: 347 Street Cam
Replies: 37
Views: 743

Re: 347 Street Cam

I am not well versed on EFI. Where is the MAP sensor located on your EFI throttle body? Has a port to the plenum, below the throttle blades. That "port" has to see BOTH sides of the split plenum. Puting the MAP sensor on a carb spacer /plenum divider combo with 2 ports (1 to each plenum ½) will all...
by F-BIRD'88
Tue Jan 31, 2023 5:39 pm
Forum: Engine Tech
Topic: 347 Street Cam
Replies: 37
Views: 743

Re: 347 Street Cam

I am not well versed on EFI. Where is the MAP sensor located on your EFI throttle body? I do know that the MAP sensor has to be able to see all the intake pulses (all 8 cylinders) wether the plenum is open style or divided style. The Dual plane RPM manifold will pull well over 6000 rpm even with the...
by F-BIRD'88
Tue Jan 31, 2023 5:22 pm
Forum: Engine Tech
Topic: 347 Street Cam
Replies: 37
Views: 743

Re: 347 Street Cam

I like the PSI ct 1225 springs for thia job. I'm betting on the milder choice 230/236 XR cam on 112 LSA. I think overall you'll like this one best. Modding the Edelbrock Performer RPM for EFI injectors for your EFI system is interesting. Lots of toeque plenty powerfull well over 6000+ rpm on your 34...
by F-BIRD'88
Tue Jan 31, 2023 7:04 am
Forum: Engine Tech
Topic: 347 Street Cam
Replies: 37
Views: 743

Re: 347 Street Cam

If you do change the cam to a lil solid roller cam be sure your valve springs are uo to that . Comp will recomend compatable seat and open spring force. Think 155-200 seat. 380 420 open for those XR cams. The individual runner intake is interesting if it has longer length high velocity runners. (May...
by F-BIRD'88
Tue Jan 31, 2023 5:53 am
Forum: Engine Tech
Topic: 347 Street Cam
Replies: 37
Views: 743

Re: 347 Street Cam

The more I look at this the more I like the milder Comp 230/236 XR cam but ground on 112 ° LSA. 107/117 or 108/116 installed phasing. You can "adjust" the running duration on these. for effect. If you want "more cam" make the valve lash smaller EG: .008" to .012" set cold. This makes the lil XR cam ...
by F-BIRD'88
Tue Jan 31, 2023 5:07 am
Forum: Engine Tech
Topic: 347 Street Cam
Replies: 37
Views: 743

Re: 347 Street Cam

Note: on some TBI EFI setups they cannot tolorate a fully split isolated divided plenum wether single plane or dual plane. It depends where the MAP sensor is mounted on the T body. If its on one side of the plenum there needs to be at least partical plenum sharing (a hole or slot in the plenum divid...
by F-BIRD'88
Tue Jan 31, 2023 4:49 am
Forum: Engine Tech
Topic: 347 Street Cam
Replies: 37
Views: 743

Re: 347 Street Cam

I assume with solid rollers on a hyd roller cam you are running the valve lash very tight.(.002" to .006"). As a short test what happens if when you re- adjust the valve lash bigger to reduce running duration and overlap? Short term "drivability test" What valve lash setting does it likw best? This ...
by F-BIRD'88
Tue Jan 31, 2023 12:58 am
Forum: Engine Tech
Topic: Low speed (1500-1800 RPM) driveability issue
Replies: 145
Views: 8221

Re: Low speed (1500-1800 RPM) driveability issue

Is you hyd roller cam (107° LSA) a Thumpr Cam? These cams need a ton of base initial spark timing at idle. 18 base + vacuum advance at idle is NOT ENOUGH. You need to recurve the diz mechanical adv curve for a SHORT limited 10° advance curve. This will allow 26-28 ° Base initial timing and 36-38 to...
by F-BIRD'88
Tue Jan 31, 2023 12:38 am
Forum: Engine Tech
Topic: Low speed (1500-1800 RPM) driveability issue
Replies: 145
Views: 8221

Re: Low speed (1500-1800 RPM) driveability issue

Is you hyd roller cam (107° LSA) a Thumpr Cam? These cams need a ton of base initial spark timing at idle. 18 base + vacuum advance at idle is NOT ENOUGH. You need to recurve the diz mechanical adv curve for a SHORT limited 10° advance curve. This will allow 26-28 ° Base initial timing and 36-38 tot...