Bellhousings
From Crankshaft Coalition Wiki
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==Overview== | ==Overview== | ||
| − | As everyone probably already knows, the | + | As everyone probably already knows, the bell housing is the mechanical/structural connection between the engine and transmission, and also serves to protect the clutch, flywheel, throw out bearing and other related parts in manual transmission applications, or to protect the torque converter in an automatic transmission application. |
==Applications== | ==Applications== | ||
| − | The | + | The bell housing may or may not be an integral part of the transmission. In some cases like the early Hemi and the Ford flathead V8, the bellhousing was cast as part of the engine block.[[File:1938-'48_59A_FORD_BLOCK_BELLHOUSING_DETAIL.jpg|thumb|left|200px|1938-’48 Ford 59A]][[File:331 CID 1951 HEMI BELLHOUSING DETAIL.jpg|200px|thumb|left|331 cid 1951 Hemi bell housing detail]] |
| − | Early on, the bellhousing was almost always made of cast iron due to the ease of manufacturing, strength and low cost. Later, aluminum came into use more and more until now where they are almost exclusively made of aluminum alloy for the weight savings. Aftermarket | + | Early on, the bellhousing was almost always made of cast iron due to the ease of manufacturing, strength and low cost. Later, aluminum came into use more and more until now where they are almost exclusively made of aluminum alloy for the weight savings. Aftermarket bell housings may be made of cast aluminum or steel. |
| − | In certain racing classes, a sanctioning body may require a “scatter shield” be used on both manual and automatic transmissions. This can be a specially made | + | In certain racing classes, a sanctioning body may require a “scatter shield” be used on both manual and automatic transmissions. This can be a specially made bell housing or an added-on ballistic blanket-type affair. The point of it is to contain the shrapnel in the case of a catastrophic failure. It’s not unheard of for a failed flywheel to saw its way into the driver’s compartment, or to have pieces penetrate the floorboards, and this can even endanger spectators. Such a failure happened to Don Garlits and this accident- while almost costing him a foot- was the impetus for him designing the first truly successful rear engine Top Fuel dragster. Racing bell housings that meet [http://www.sfifoundation.com/ SFI] 6.1 certification are able to contain a 13 inch (33 cm) diameter, 30 pound (13.6 kg) flywheel made of steel, cast iron or comparable material, that explodes between 8,000 and 9,000 RPM. Any material can be used to make such a bellhousing as long as it can pass the test. |
| − | Ever since there were hotrods being made, there have been transmissions from one make mated to engines of a different make. To that end, custom | + | Ever since there were hotrods being made, there have been transmissions from one make mated to engines of a different make. To that end, custom bell housings, engine plates and/or adapter plates are used to join them together. This continues to this day. <br style="clear:both"/> |
====Adaptors==== | ====Adaptors==== | ||
TCI and Trans-Dapt make adaptor plates for mounting a BOP transmission to a Chevy engine or vice versa. They are plenty sturdy for all but the most demanding circumstances, and the cost is relatively low. | TCI and Trans-Dapt make adaptor plates for mounting a BOP transmission to a Chevy engine or vice versa. They are plenty sturdy for all but the most demanding circumstances, and the cost is relatively low. | ||
| − | [[File:Tci detail.jpg|thumb|300px|left|TCI adaptor p/n 230001 for Buick, Cadillac, Oldsmobile, Pontiac engines to Chevy transmissions]]<br style="clear:both"/>[[File:WILCAP ADAPTOR EARLY HEMI TO TH350.jpg|200px|thumb|left|Wilcap adaptor on early Hemi for using TH350 transmission]] Wilcap offers an adaptor to mount the TH350 tranny to the early Chrysler Hemi (above).<br style="clear:both"/> | + | [[File:Tci detail.jpg|thumb|300px|left|TCI adaptor p/n 230001 for Buick, Cadillac, Oldsmobile, Pontiac engines to Chevy transmissions]]<br style="clear:both"/>[[File:WILCAP ADAPTOR EARLY HEMI TO TH350.jpg|200px|thumb|left|Wilcap adaptor on early Hemi for using TH350 transmission]] Wilcap offers an adaptor to mount the TH350 tranny to the early Chrysler Hemi (above).<br style="clear:both"/> |
==Automatic transmission bellhousings== | ==Automatic transmission bellhousings== | ||
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The 5-1/8" truck bellhousing bores can be reduced down to the commonly used 4-11/16" bore size by using a machined ring available from the aftermarket. | The 5-1/8" truck bellhousing bores can be reduced down to the commonly used 4-11/16" bore size by using a machined ring available from the aftermarket. | ||
| − | In the case of Chevy bellhousings, there are several that are often preferred for use in modern vehicles. One is the casting number 3899621 bellhousing that fits the 11" clutch. Truck bellhousings have to be selected carefully if used in a passenger car application. Some will have a larger bearing housing hole for the transmission input shaft. There are adaptor rings made to allow them to be used. Later bellhousings used in the GM F | + | In the case of Chevy bellhousings, there are several that are often preferred for use in modern vehicles. One is the casting number 3899621 bellhousing that fits the 11" clutch. Truck bellhousings have to be selected carefully if used in a passenger car application. Some will have a larger bearing housing hole for the transmission input shaft. There are adaptor rings made to allow them to be used. Later bellhousings used in the GM F-body cars with the Borg Warner T5 have the transmission tipped over, and there are bellhousings that have provisions for mounting a hydraulic clutch slave cylinder. A page showing this and other bellhousings and associated info is from [http://www.garage-scene.com/t5-into-ag-body/t5_install_bellhousing.htm#14060627 Garage-Scene.com] |
The bellhousing has to be aligned correctly to the crankshaft centerline. This will allow less wear and a smoother drivetrain. Offset dowels are available to correct this alignment if it’s found to be off. More on this page by [http://www.hurst-drivelines.com/wp-contehud/uploads/GM-Dial-Indicating-RobbMC-instructions-Revised-6-15-09A.pdf Hurst]. | The bellhousing has to be aligned correctly to the crankshaft centerline. This will allow less wear and a smoother drivetrain. Offset dowels are available to correct this alignment if it’s found to be off. More on this page by [http://www.hurst-drivelines.com/wp-contehud/uploads/GM-Dial-Indicating-RobbMC-instructions-Revised-6-15-09A.pdf Hurst]. | ||
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