All Small Six Reasonable expectations on power for a 200ci

This relates to all small sixes
SCCARob

SCCARob

New member
Hi everyone! I hope that I can ask something that might be really silly, but after reading through the forums and the tech articles from the classic inlines archive. I was wondering what a reasonable explanation of power would be with the following build:

-200ci block (also would a 250 be better overall?)
-2v direct mount modded and cleaned up Large log head
-9.5-10:1 compression
-Headers
-2300 Holley or 2300 sniper efi
-CSC 274-12 HSP cam
-High performance ignition

I am well aware of the flow limitations of the log head and with the lack of availability of the vintage inline head or the 250-2v Aussie and want to understand what a reasonable explanation would be giving the more commonly available pieces.

what I am looking for is a character similar to that of a Nissan 240z in a 67 mustang with a Ford inline, smooth idle and power delivery that wants to rev out a bit (6200-6500max) and have a sporty and willing nature behind a t5 and 3.50 gears. With all the brake and suspension upgrades available, it should be able to give the Miata and BRZ/GR86 crowd a good run for their money.....maybe a slow driver in a V8 mustang or Camaro on a short track too :)
 
Since HP is a function of torque and RPM, simply reving it up to 6000-6500 gives more HP ( as long as the torque doesn't fall off.) You plans would seem to support that greater RPM. Remember, an engine is basically and air pump--get the air in and get it back out.
Don't forget light-weight valve keepers.
 
Something's odd about Dyno #9? HP and TQ should be exactly equal at 5252 rpm (it's math). This shows 11hp down at 5250 rpm (-2 rpm). Anyone know what's up there? Typo?
 
No log head is going to run like the L series datto engine, its SOHC to start with. If you want to get close in a ford go for the 4 litre SOHC six from Australia. However if you want a good torquey six and keep your 200 (really dont know why you would when a 250 is tonnes better) then you really need to get a good head, 2v or cross flow at least. See what Mustang six did with a crossflow 250 EFI, that would eat a datto six.
 
With your eng build run the 2300 Sniper & a Hyper spark dist along with an intank efi pump . You'll be surprised what you motor will be like .
 
SCCARob said:
Do you know if that was wheel or crank numbers, I can't find a note about it? It seems like wheel to me but the graph is interesting to look at.
Click to expand...
Horse Power and Torque numbers are at the Rear Wheels unless otherwise noted is posted on there.
 
aussie7mains said:
No log head is going to run like the L series datto engine, its SOHC to start with. If you want to get close in a ford go for the 4 litre SOHC six from Australia. However if you want a good torquey six and keep your 200 (really dont know why you would when a 250 is tonnes better) then you really need to get a good head, 2v or cross flow at least. See what Mustang six did with a crossflow 250 EFI, that would eat a datto six.
Click to expand...
Hey Mate im still getting familiar with this forum.
I wanted to send you a private message to ask you how I can find Mustang six and look into what he has done with his EFI crossflow.

Im based in New Zealand and currently doing some research into building a 200/250 with a crossflow head to go into a 66 mustang.

Chur,
Kris
 
Inline6-66 said:
Hey Mate im still getting familiar with this forum.
I wanted to send you a private message to ask you how I can find Mustang six and look into what he has done with his EFI crossflow.

Im based in New Zealand and currently doing some research into building a 200/250 with a crossflow head to go into a 66 mustang.

Chur,
Kris
Click to expand...
Others may be able to find him, it was years ago. If your in NZ there should be plenty of falcons around with crossflows and SOHC engines, Given that you would be silly to try and mod the pre-crossflow six, just go straight to a SOHC, these are up to 172kw in stock form, more than a 302 could do in stock form. Plenty of bits for them.
 
aussie7mains said:
Others may be able to find him, it was years ago. If your in NZ there should be plenty of falcons around with crossflows and SOHC engines, Given that you would be silly to try and mod the pre-crossflow six, just go straight to a SOHC, these are up to 172kw in stock form, more than a 302 could do in stock form. Plenty of bits for them.
Click to expand...
Your right there is plenty of the Barra motors around though im wanting to keep the old 200-250cui engine in the car for now and do the mods.
Its not exactly going to be original but wanting to keep it somewhat original just with performance upgrades and putting a 250 crossflow or 2v head on top of the original 200cui.
Then again why would I put a 250 head on a 200 when I could chuck a 250 complete motor in instead.

So my thoughts now are to find a 250 block with a 250 crossflow or 2v (still unsure which to go for as there is different preferences between everyone)
 
Inline6-66 said:
Your right there is plenty of the Barra motors around though im wanting to keep the old 200-250cui engine in the car for now and do the mods.
Its not exactly going to be original but wanting to keep it somewhat original just with performance upgrades and putting a 250 crossflow or 2v head on top of the original 200cui.
Then again why would I put a 250 head on a 200 when I could chuck a 250 complete motor in instead.

So my thoughts now are to find a 250 block with a 250 crossflow or 2v (still unsure which to go for as there is different preferences between everyone)
Click to expand...
A 250 crossflow with minor mods will easily make more power than a 2v headed 250. Fitting a crossflow head to any precrossflow block is IMO too much trouble, especially when a whole crossflow engine is available. Even a 200 crossflow would give quite a bit better performance than a 200 precross. Getting a 2v head is going to cost you more than working up a 250Xflow. There is a fair bit of performance gear for crossflows nowdays, Id go there. Im open for emails if you want to go that way. Im on facebook, Jeffrey Craig Sewell
 
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