Switching to a single plane intake!
#21
Race Director
What about a hogan sheet metal intake?
Ive seen f body lt1's (centrifugal supercharger) pick up 100 hP.
Why not consider one of those? Sure they are expensive, but if you were worried about cost you wouldnt be here
Ive seen f body lt1's (centrifugal supercharger) pick up 100 hP.
Why not consider one of those? Sure they are expensive, but if you were worried about cost you wouldnt be here
#22
Melting Slicks
Truth is, most of us are willing to spend money on modifications that "also" provides "the best bang for the buck". That might mean some modification, or fabrication on our end.
Sheet metal intake manifolds are ridiculously overpriced (in my opinion). I guess if I was building a $60,000 dollar motor, I'd consider one. lol
#23
Burning Brakes
I don't want to drag this thread OT but Mnstlt1 posted some links and....
Who and what is this (elbow)? I think I've seen it before.
OOh, it's a FORD 4.6 elbow. (Knew I've been down this road before).
Who and what is this (elbow)? I think I've seen it before.
OOh, it's a FORD 4.6 elbow. (Knew I've been down this road before).
Last edited by DanZ51; 01-19-2014 at 10:56 PM. Reason: Found it:
#24
Burning Brakes
Its disapointing you c4 guys have such low hood clearance, even late model fbodies are similar. Elbows like that with such a short radius 90 deg or worse, a 90-120 deg bend into intake is terrible for flow and a huge loss factor. Almost offsets the gains a single plane could give.
#26
Melting Slicks
http://www.sullivanperformance.com/y.../tbadapter.htm
I'm trying to post helpful information for other corvette owner's interested in a swap like this. OT, if I am imposing on your thread, please let me know. I apologize in advance.
#27
Instructor
Thread Starter
Member Since: Apr 2005
Location: Göteborg
Posts: 228
Likes: 0
Received 0 Likes
on
0 Posts
That is a Sullivan upper intake, on a custom lower.
http://www.sullivanperformance.com/y.../tbadapter.htm
I'm trying to post helpful information for other corvette owner's interested in a swap like this. OT, if I am imposing on your thread, please let me know. I apologize in advance.
http://www.sullivanperformance.com/y.../tbadapter.htm
I'm trying to post helpful information for other corvette owner's interested in a swap like this. OT, if I am imposing on your thread, please let me know. I apologize in advance.
#28
Burning Brakes
Can anyone confirm if either of these 2 setups will fit under a stock c4 hood: Accel 74140 Pro Ram intake with the Nitrous Outlet LT1 Elbow # 03-20000 or the Edelbrock Victor EFI 29785 intake with the Nitrous Outlet LT1 elbow # 03-20000
#29
Instructor
Thread Starter
Member Since: Apr 2005
Location: Göteborg
Posts: 228
Likes: 0
Received 0 Likes
on
0 Posts
Thanks for the different suggestions how to make this work! Since I already have the Victor E and the Edelbrock elbow I will however use these but if it by any reasons does not work I now have several other options to look into.
I cannot really say if the Victor E and a Nitrous outlet elbow fit without modification. I can take some measurements on my Victor E and check distance to the inside of the hood if that helps.
I cannot really say if the Victor E and a Nitrous outlet elbow fit without modification. I can take some measurements on my Victor E and check distance to the inside of the hood if that helps.
#32
Melting Slicks
*Also - reach out to Nitrous Outlet and ask them if they have any c4 customers they can refer you to OR that have experience with various single-plain manifolds.
#33
Instructor
Thread Starter
Member Since: Apr 2005
Location: Göteborg
Posts: 228
Likes: 0
Received 0 Likes
on
0 Posts
I have now made some more measurements and I think I have an idea how to port the intake now. I will use the CSA at the pushrod pinch in the head as a guide for minimum runner CSA in the intake. It looks like I will need to widen (from the manifold flange) the first 1-2 inch of the runner and straighten the runner slightly. I will probably focus on removing material from the roof so I won't portmatch the intake. I think getting the right angle of the manifold runner towards the head and sufficient CSA is enough at this stage.
Another thing is that the CSA of the outer runners (cyl 1, 2, 7, 8) is about 20% larger at the plenum versus the inner runners and cause the tapering of the outer runners to be alot more pronounced. I guess this will crate differences in air speed at the manifold ports but if this matters, who know? I will probably widen the inner runners at the plenum to reduce the difference in CSA.
Still waiting on getting my spacer milled down.
I checked the distance from the carb pad of the victor E to the inside of the hood: 135mm at the front bolt holes and 140mm's at the rear bolt holes. Please note that the carb pad is slightly tilted forward (3degrees I recall) but also the hood. Its difficult to get an exact distance and there are surely other factors that could create errors so keep that in mind.
Another thing is that the CSA of the outer runners (cyl 1, 2, 7, 8) is about 20% larger at the plenum versus the inner runners and cause the tapering of the outer runners to be alot more pronounced. I guess this will crate differences in air speed at the manifold ports but if this matters, who know? I will probably widen the inner runners at the plenum to reduce the difference in CSA.
Still waiting on getting my spacer milled down.
I checked the distance from the carb pad of the victor E to the inside of the hood: 135mm at the front bolt holes and 140mm's at the rear bolt holes. Please note that the carb pad is slightly tilted forward (3degrees I recall) but also the hood. Its difficult to get an exact distance and there are surely other factors that could create errors so keep that in mind.
Last edited by bogor; 01-22-2014 at 06:54 PM.
#34
Melting Slicks
I have now made some more measurements and I think I have an idea how to port the intake now. I will use the CSA at the pushrod pinch in the head as a guide for minimum runner CSA in the intake. It looks like I will need to widen (from the manifold flange) the first 1-2 inch of the runner and straighten the runner slightly. I will probably focus on removing material from the roof so I won't portmatch the intake. I think getting the right angle of the manifold runner towards the head and sufficient CSA is enough at this stage.
Another thing is that the CSA of the outer runners (cyl 1, 2, 7, 8) is about 20% larger at the plenum versus the inner runners and cause the tapering of the outer runners to be alot more pronounced. I guess this will crate differences in air speed at the manifold ports but if this matters, who know? I will probably widen the inner runners at the plenum to reduce the difference in CSA.
Still waiting on getting my spacer milled down.
I checked the distance from the carb pad of the victor E to the inside of the hood: 135mm at the front bolt holes and 140mm's at the rear bolt holes. Please note that the carb pad is slightly tilted forward (3degrees I recall) but also the hood. Its difficult to get an exact distance and there are surely other factors that could create errors so keep that in mind.
Another thing is that the CSA of the outer runners (cyl 1, 2, 7, 8) is about 20% larger at the plenum versus the inner runners and cause the tapering of the outer runners to be alot more pronounced. I guess this will crate differences in air speed at the manifold ports but if this matters, who know? I will probably widen the inner runners at the plenum to reduce the difference in CSA.
Still waiting on getting my spacer milled down.
I checked the distance from the carb pad of the victor E to the inside of the hood: 135mm at the front bolt holes and 140mm's at the rear bolt holes. Please note that the carb pad is slightly tilted forward (3degrees I recall) but also the hood. Its difficult to get an exact distance and there are surely other factors that could create errors so keep that in mind.
#35
Instructor
Thread Starter
Member Since: Apr 2005
Location: Göteborg
Posts: 228
Likes: 0
Received 0 Likes
on
0 Posts
#37
Burning Brakes
My elbow is big. It needs a 4" cowl on a camaro to clear lol
#38
Safety Car
I told a poster here I would be happy to show some pics of my LTX single plane conversion and post up measurements.
The intake itself was an Edelbrock Super Victor PN 2925. The sheetmetal elbow/TB adapter is custom made... however you can see it is similar to the peice Nitrous Outlet offers.... Just comparing the pics mine appears to have quite a bit of downward angle on the TB mounting flange compared to the Nitrous Outlet one (we did this for hood clearance).
However the 28975 Victor EFI intake is not nearly as tall as my 2925 Super Victor intake - So the Nitrous Outlet adpater may fit OK under a C4 Corvette hood.
A few pics of mine.
As for measurements. You have almost 9" from the bottom of the hood (on a 92) if you measure from the top of the front china rail on the engine block.... This is right about where you TB mounting flange should be located....
You have anywhere from .5 to 1.5" additional height from the rear china rail area - So measuring from the rear of the engine block will get you into trouble because of how the hood slopes downward in the front. The further forward from the front china rail you go the less height to the hood you have.
My set up measures 8 1/4" tall - measured from the china rail on the block to the top of the TB.
It measures 16" long - measured from the rear carb flange to the end of the TB where it hooks up to the air cleaner duct.
Don't forget I have about a 10* downward angle on my TB.
I hope this helps some of you guys out.
Will
The intake itself was an Edelbrock Super Victor PN 2925. The sheetmetal elbow/TB adapter is custom made... however you can see it is similar to the peice Nitrous Outlet offers.... Just comparing the pics mine appears to have quite a bit of downward angle on the TB mounting flange compared to the Nitrous Outlet one (we did this for hood clearance).
However the 28975 Victor EFI intake is not nearly as tall as my 2925 Super Victor intake - So the Nitrous Outlet adpater may fit OK under a C4 Corvette hood.
A few pics of mine.
As for measurements. You have almost 9" from the bottom of the hood (on a 92) if you measure from the top of the front china rail on the engine block.... This is right about where you TB mounting flange should be located....
You have anywhere from .5 to 1.5" additional height from the rear china rail area - So measuring from the rear of the engine block will get you into trouble because of how the hood slopes downward in the front. The further forward from the front china rail you go the less height to the hood you have.
My set up measures 8 1/4" tall - measured from the china rail on the block to the top of the TB.
It measures 16" long - measured from the rear carb flange to the end of the TB where it hooks up to the air cleaner duct.
Don't forget I have about a 10* downward angle on my TB.
I hope this helps some of you guys out.
Will
#39
Melting Slicks
rklessdriver- great information, and I appreciate you posting the measurements. This can be valuable for anyone else entertaining a single-plain swap (like myself).
bogor- the welded TB elbow looks great!
bogor- the welded TB elbow looks great!
#40
Instructor
Thread Starter
Member Since: Apr 2005
Location: Göteborg
Posts: 228
Likes: 0
Received 0 Likes
on
0 Posts
Got my spacer and testfitted the elbow and TB
Its a tight fit everywhere (fuel rail, valve cover and hood) but with some additional grinding here and there it will fit
To get the elbow horizontal, the spacer need to be angled milled so its 16mm at one end and 21 mm on the other.
Its a tight fit everywhere (fuel rail, valve cover and hood) but with some additional grinding here and there it will fit
To get the elbow horizontal, the spacer need to be angled milled so its 16mm at one end and 21 mm on the other.
Last edited by bogor; 01-28-2014 at 04:53 PM.