Speed-Talk is running on www.Speed-Talk.com

IMPORTANT: Update your bookmarks to https://www.speed-talk.com/forum/
(Right-click the URL and select "Bookmark this link")

Search found 9182 matches

by F-BIRD'88
Thu Feb 02, 2023 1:08 pm
Forum: Engine Tech
Topic: Camshaft question - guys with 6-71 blower experience
Replies: 6
Views: 137

Re: Camshaft question - guys with 6-71 blower experience

Just roughly looking at it with the limited information I'd say that with the generous port flow / CID and the generous extended camshaft exhaust duration that this one is going to want to make peak horsepower well up there in rpm. The generous exhaust valve events allow the engine to keep breathing...
by F-BIRD'88
Wed Feb 01, 2023 4:02 am
Forum: Engine Tech
Topic: cam duration
Replies: 15
Views: 1343

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...