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Carb Vs Turbo Long Block


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10 replies to this topic

#1 Subarunner

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Posted 20 October 2004 - 10:27 AM

My 86' Turbo wagon engine is nearly worn out and I have an 86' carbed engine with only 120K on it. Can I bolt the Turbo stuff onto the carbed long block or are they set up differently for turbo?

Thanks
Have Fun!
Corbin

#2 WJM

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Posted 20 October 2004 - 11:15 AM

everything will bolt up. Be careful aobut timing and run premium gas.

the only mod is the rear block PCV vent is not present on CARB/SPFI blocks...so you will ahve to block that off for the turbo stuff on the manifold. Easy peasy fix.

#3 subaru_styles

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Posted 20 October 2004 - 11:47 AM

do it..


wow, these turbo carb blocks are starting to become more popular.

#4 calebz

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Posted 20 October 2004 - 12:56 PM

A little clarification


The turbo stuff will NOT bolt on to a carb long block.

It will however, work on a carb shortblock.

You need to use the turbo heads and associated stuff.

#5 Snowman

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Posted 20 October 2004 - 02:13 PM

I don't want to sound like a naysayer, but for the sake of informedness and since there is the possibility that I could pursue a similar setup in the near future, what is the longest that one of these turbo-on-carb-block engines has held together? The most long-lived one I know of is WJM's, which was good for something like 20k.

#6 subaru_styles

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Posted 20 October 2004 - 02:23 PM

wjm used a spfi block, BIG difference in compression there. the carb block is just slightly higher than [turbo] stock

#7 WJM

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Posted 20 October 2004 - 02:52 PM

A little clarification


The turbo stuff will NOT bolt on to a carb long block.

It will however, work on a carb shortblock.

You need to use the turbo heads and associated stuff.


Oh, i missed that LONG/SHORT block part...NO..wont fit LONG block...but will SHORT block.

I don't want to sound like a naysayer, but for the sake of informedness and since there is the possibility that I could pursue a similar setup in the near future, what is the longest that one of these turbo-on-carb-block engines has held together? The most long-lived one I know of is WJM's, which was good for something like 20k.


24k miles.

s_s: Yes, 9.5:1 as compared ot 8.5:1 is ALOT in turbo world....I still dont see how the shortblocks have different compression ratios....as the P#'s were the same the last time I looked them up....

#8 subaru_styles

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Posted 20 October 2004 - 03:21 PM

s_s: Yes, 9.5:1 as compared ot 8.5:1 is ALOT in turbo world....I still dont see how the shortblocks have different compression ratios....as the P#'s were the same the last time I looked them up....


please correct me if I'm wrong, but isn't it mostly the pistons that create the compression differences.

#9 calebz

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Posted 20 October 2004 - 04:30 PM

s_s: Yes, 9.5:1 as compared ot 8.5:1 is ALOT in turbo world....I still dont see how the shortblocks have different compression ratios....as the P#'s were the same the last time I looked them up....


No, the part numbers are different.. This came up a while back and I actually posted the part numbers. It is 100% the pistons that make the difference between the ranges of compression in EA82 motors. IIRC, I posted P/Ns for 1987, as it was the only full production year with all three fuels systems in the US.

Basically it is like this

Piston tops:

Turbo - concaved
carb - Flat
SPFI - convex

#10 NorthWet

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Posted 20 October 2004 - 05:10 PM

I don't want to sound like a naysayer, but for the sake of informedness and since there is the possibility that I could pursue a similar setup in the near future, what is the longest that one of these turbo-on-carb-block engines has held together? The most long-lived one I know of is WJM's, which was good for something like 20k.


Gee, so if/when I build my turbo-on-SPFI-block, all I have to do is last more than 20k to be considered a success? :drunk:

#11 Subarunner

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Posted 20 October 2004 - 07:24 PM

Thanks for the great info everyone!

I think I go ahead with the Turbo on carb short block and drive the crap out of it while I put together another turbo motor on the side.

Have Fun!
Corbin




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