Intake manifold
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| + | [[File:Typhoon 52021.jpg|thumb|300px|Typhoon p/n 52021]] | ||
Professional Products makes a knock-off of this design also, called the Typhoon, p/n 52021 for satin finish. | Professional Products makes a knock-off of this design also, called the Typhoon, p/n 52021 for satin finish. | ||
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===Air gap=== | ===Air gap=== | ||
| − | The so-called "air gap" intake concept has been around since the late '40s-early '50s. It has been used by various auto makers through the years, like Pontiac, as original equipment. Air can circulate beneath the plenum; the plenum is separated from the hot motor oil being splashed onto the bottom of the intake where it seals the lifter valley. | + | [[File:Rpm 7501 air-gap.jpg|thumb|400px|left|Edelbrock SBC RPM Air-Gap intake. Air can circulate beneath the plenum; plenum is separated from the hot motor oil being splashed onto the bottom of the intake where it seals the lifter valley.]] |
| + | The so-called "air gap" intake concept has been around since the late '40s-early '50s. It has been used by various auto makers through the years, like Pontiac, as original equipment. Air can circulate beneath the plenum; the plenum is separated from the hot motor oil being splashed onto the bottom of the intake where it seals the lifter valley. | ||
| − | Only because the Chevy V8 uses the intake bottom to seal the lifter valley is this | + | Only because the Chevy V8 uses the intake bottom to seal the lifter valley is this considered to be an improvement. Other engine that use a separate plate to cover the lifter valley have had "air gap" intakes all along. But with the SBC engine, especially if using Vortec or aftermarket heads that lack a heat crossover beneath the plenum, the engine may tend to be cold-blooded until the intake comes up to temperature from engine heat. |
| − | + | That means the Edelbrock Air-Gap intake will require a longer warm-up. In cold weather this can lead to driveability problems, almost like a tunnel ram. The air/fuel mixture- if tuned for a fully warmed up engine- will be lean until the engine is up to temp. This can be compensated for by the choke, but if using the choke, spirited driving is out until the choke is fully open. | |
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===Single plane=== | ===Single plane=== | ||
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==Carb spacers== | ==Carb spacers== | ||
| + | Carb spacers in their various designs are often used as a tuning aid and for helping to make power in the range where it's needed. | ||
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| + | ===Open spacer=== | ||
| + | Tend to boost output in the upper range and will increase plenum volume. On an intake like the Edelbrock RPM (non Air Gap) dual plane intake, using an open 1" spacer will let the intake make identical power to the cut down plenum divider of the Air Gap. | ||
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| + | ===Divided spacer=== | ||
| + | These will retain the dual plenum low-to-midrange benefits while possibly raising the power peak. Tends to make the runners seem longer. | ||
| + | [[File:CARB SPACERS WOOD Q-JET 001.jpg|thumb|300px|left|Pair of homemade spacers.]] | ||
| + | [[File:CARB SPACERS WOOD Q-JET single.jpg|thumb|300px|left|Spacer made specifically to fit the Pontiac Performer intake. Spacer is upside down.]] | ||
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| + | ===Also see:=== | ||
| + | *[http://www.hotrodders.com/forum/carb-spacer-163755.html Carb spacer] thread on Hotrodders forum. | ||
| + | *[http://cms.nhra.com/dragster/1999/issue05/racing_technology.html Racing Technology Tuning with carburetor spacers] from NHRA.com | ||
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==Marine intakes== | ==Marine intakes== | ||
[[File:VORTEC ALUM INTAKE VOLVO PN 3856270.jpg|thumb|300px|left|Volvo Penta p/n 3856270 marine intake with brass water crossover/thermostat port.]] | [[File:VORTEC ALUM INTAKE VOLVO PN 3856270.jpg|thumb|300px|left|Volvo Penta p/n 3856270 marine intake with brass water crossover/thermostat port.]] | ||
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==Intake installation== | ==Intake installation== | ||
| − | Generally speaking, using RTV on intake gaskets acts as a lubricant until it's set up; using it alone can let the gaskets slip out of position when tightened. Most gasket makers caution against using RTV, especially on the side of the gasket that has an RTV bead applied at the time of manufacture. Instead of using RTV over the entire gasket surface, use weatherstripping cement or Gasgacinch on one side of the gasket to hold the gasket in place. Nothing is | + | Generally speaking, using RTV on intake gaskets acts as a lubricant until it's set up; using it alone can let the gaskets slip out of position when tightened. Most gasket makers caution against using RTV, especially on the side of the gasket that has an RTV bead applied at the time of manufacture. Instead of using RTV over the entire gasket surface, use [http://3mcollision.com/3m-super-weatherstrip-and-gasket-adhesive-08002-yellow.html 3-M weatherstripping cement] or [http://www.summitracing.com/parts/EDL-9300/ Gasgacinch] on one side of the gasket to hold the gasket in place. These are able to hold a gasket in position almost immediately if applied by the directions. Nothing is needed on the other side in most cases, although a light application of RTV (following the directions for skim time) or one of the non-hardening sealers mentioned above can be used around the water crossovers on ''both'' sides of the gaskets, in conjunction with the cement. |
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| + | Some prefer to use [http://www.permatex.com/products/automotive/automotive_gasketing/gasket_sealants/Permatex_Super_300_Form-A-Gasket_Sealant.htm Permatex 300] or [http://www.permatex.com/products/Automotive/automotive_gasketing/gasket_sealants/auto_Permatex_Aviation_Form-A-Gasket_No_3_Sealant_a.htm Permatex Aviation] non-hardening sealers. | ||
| − | {{Note1}}A | + | {{Note1}} A couple cut off bolts or studs can be used to position the gasket perfectly, remove before installing the intake. |
RTV should be used on the ends of a Chevy intake instead of the cork or rubber seals supplied with many gasket sets. Apply a 1/4" thick bead of RTV across the seal surface at each end of the block. If using an O2 sensor be sure to use sensor safe RTV. | RTV should be used on the ends of a Chevy intake instead of the cork or rubber seals supplied with many gasket sets. Apply a 1/4" thick bead of RTV across the seal surface at each end of the block. If using an O2 sensor be sure to use sensor safe RTV. | ||
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[[File:Heat shield rivets.jpg]] <br style="clear:both"/> | [[File:Heat shield rivets.jpg]] <br style="clear:both"/> | ||
| + | ==References== | ||
| + | {{Develop1}} | ||
[[Category:Engine]] | [[Category:Engine]] | ||
[[Category:Carburetors]] | [[Category:Carburetors]] | ||
[[Category:undeveloped articles]] | [[Category:undeveloped articles]] | ||
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