20V MK1 Engine Swap BT w/ original 5 speed?

camry90 · 10-06-2009, 02:05 AM

i have found localy a BT longblock with ECU and wireing. how would it be to match it with my 86 NA tranny? i mean gearing wise. do i absolutly need to use the short 5 speed or even the 6 speed?

mr220v · 10-06-2009, 09:10 AM

You can use the c50's gearing without a problem. The only difference between the c50/52 and the c56 is the c56 has a bit shorter 3rd and 4th. The 6speed is nice, but not necessary.

Raptor13x · 10-06-2009, 09:23 AM

The one issue you'll run into with the C50 is the fact that the starter mounts on the exhaust side, which interferes with the BT exhaust manifold. You'll need to either get a C52, where you can mount the starter on the intake side, or make a custom exhaust manifold so it clears the starter.

Make sure you read all the stickies on what you need to do the swap. Most of it is pretty easy, but there are a few snags to look out for. Have mr220v modify the wiring harness for you, unless you enjoy pain and suffering.

camry90 · 10-07-2009, 02:24 AM

thanks guys

10-06-2009, 02:05 AM	#1 (permalink)
camry90 No Skills Join Date: Oct 2009 Posts: 6 Thanks: 0 Thanked 0 Times in 0 Posts iTrader Rating: (0/0% )	BT w/ original 5 speed? i have found localy a BT longblock with ECU and wireing. how would it be to match it with my 86 NA tranny? i mean gearing wise. do i absolutly need to use the short 5 speed or even the 6 speed?

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10-06-2009, 09:10 AM	#2 (permalink)
mr220v Beams Owners Group Join Date: Mar 2006 Posts: 2,527 Thanks: 13 Thanked 176 Times in 147 Posts iTrader Rating: (11/100% )	You can use the c50's gearing without a problem. The only difference between the c50/52 and the c56 is the c56 has a bit shorter 3rd and 4th. The 6speed is nice, but not necessary.

10-06-2009, 09:23 AM	#3 (permalink)
Raptor13x Legendary Join Date: Apr 2006 Location: Farmington Hills, MI Posts: 3,997 Thanks: 7 Thanked 44 Times in 37 Posts My Google Map iTrader Rating: (5/100% )	The one issue you'll run into with the C50 is the fact that the starter mounts on the exhaust side, which interferes with the BT exhaust manifold. You'll need to either get a C52, where you can mount the starter on the intake side, or make a custom exhaust manifold so it clears the starter. Make sure you read all the stickies on what you need to do the swap. Most of it is pretty easy, but there are a few snags to look out for. Have mr220v modify the wiring harness for you, unless you enjoy pain and suffering.

10-07-2009, 02:24 AM	#4 (permalink)
camry90 No Skills Join Date: Oct 2009 Posts: 6 Thanks: 0 Thanked 0 Times in 0 Posts iTrader Rating: (0/0% )	thanks guys