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PostPosted: Fri May 11, 2018 9:38 pm 
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TBI Slant 6
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Joined: Tue Aug 19, 2003 3:52 am
Posts: 153
Location: Helsinki Finland
Car Model*: 1966 2D Dart
I like to get cam and converter combo without plenty
of trials. My setup is this.

ENGINE
225 overbored to 0.06
milled to 10:1 static
large valve head with mild porting
Block, head, steel crank from 75 truck engine
Had Mopar Perf "268" cam with 0.46 lift <= this need replacement

ACCESSORIES
Clifford 4 bbl manifold
Dutra duals. Single 2,5" pipe after "y"
Fuel injection
E85 fuel

TRANSMISSION
904 transmission with 2.45 1st gear
Transgo2 kit
Modified stock converter <= this I will replace too

POWERLINE
7.25" with 4.10 and SG
205/60R14 tires <= going to 15" wheels and tires if needed

More likely the target is <14.9 et than highway use.
Have to drive to track sometimes anyway.

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LL21A6_/6 running with fuel made from biowaste (ethanol).


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PostPosted: Mon May 14, 2018 11:25 am 
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TBI Slant 6
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Joined: Tue Aug 19, 2003 3:52 am
Posts: 153
Location: Helsinki Finland
Car Model*: 1966 2D Dart
With parts I have I get power range from 2500 up to 5000. Next cam shall have this bit higher. Plan is to order a 9,5" converter with static stall speed at 3000 or more.

The head is ready for .500 lift and I can replace springs good for the new cam.

How much degrees for the intake? And how much for the exhaust? Which lobes of Oregon cams are recommended?

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LL21A6_/6 running with fuel made from biowaste (ethanol).


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PostPosted: Mon May 14, 2018 11:55 am 
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Joined: Tue Oct 29, 2002 8:27 pm
Posts: 9523
Location: Salem, OR
Car Model*:
At 10:1 SCR and a desired .5 lift at 1.5 ratio the desired cam would have been the Erson AM Camshaft... but it would have liked headers instead of
dutras since the exhaust has a longer duration.

OCG kind of lacks a nice low .5 lift in the mid duration @ .050 range for street/strip use...the popular grind for a 10:1 engine would be a 791 or a 346 grind at 108...but neither
will have a lift over .480..(kind of similar to the Erson RV20 and RV30 grinds, their 280/270 grind was a good streetable cam for 10.3:1SCR).

I can say that given your compression ratio you could try grind 549 with an LSA about 108-109, and clock it at 100, that would keep your DCR above 8:1...
I have run this cam at 11 and 12:1 SCR and lots of porting (eliminate the valve guides in the runners), but running the lower 10:1 SCR comparatively will leave about 20-30 HP and a like amount of torque on the table at the peak powerband rpm... the cam is also somewhat lumpy due to the 248@.050... I have run this stick with both 109 and 107 LSA, and the 109 has slightly better idle manners than the 107 version (idle depending on the 'lump' was about 14-16" Hg on the vacc gauge at idle with the 109 LSA).


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PostPosted: Tue May 15, 2018 12:58 am 
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TBI Slant 6
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Joined: Tue Aug 19, 2003 3:52 am
Posts: 153
Location: Helsinki Finland
Car Model*: 1966 2D Dart
Thanks.

I don't like change my D-duals with headers as these manifolds
are pretty rare here. Was my souvenir from California from 1999.

0.500" was checked from head that it is possible but it is not
a must. #791 doesn't sound too aggressive. Like to have "some vacuum"
as I will continue MAP based fuel injection in the future.

About the valve springs. I have not asked from Oregon yet.
Do they have their own? Lifters were available as well they
told they have new cores for cam.

Then the converter issue. Can anybody here share their
experience for this area?

I copied this from the same forum:

Image

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LL21A6_/6 running with fuel made from biowaste (ethanol).


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PostPosted: Tue May 15, 2018 5:07 am 
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Joined: Mon Oct 21, 2002 11:08 am
Posts: 12597
Location: Blacksburg, VA
Car Model*:
I would probably use a 1475 on the intake and 791 on the exhaust, with 106 LSA and degree it at 100 deg intake centerline. You could also go a bit bigger with 1628 INT and 1920 EXH. 106 LSA will give you best all around power on a 225, most likely, but it does make the idle slightly rougher and vac a bit lower. With the 1475/791 cam I would still expect you to have good vacuum with 10:1. I am not sure how E85 changes things, but I expect is about the same as gasoline on a NA motor. You could probably run Mopar 340 V8 valve springs with these cams, although Oregon could likely recommend or sell you something else if it needs a bit more.

If you are looking for killer off the line performance, get a 3000-3200 RPM stall converter. Edgeracingconverters.com knows how to make a good Slant 6 converter to stall where you want it. If you want it a bit tighter, I might go for a 2600-2800 converter, but it sounds like you want the performance and are not commuting or doing long highway cruises in this. Modern converters at this stall level are not too loose until you stand on it.

Happy Slant 6 fabrication!

Lou

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PostPosted: Tue May 15, 2018 2:07 pm 
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Joined: Tue Oct 29, 2002 8:27 pm
Posts: 9523
Location: Salem, OR
Car Model*:
Quote:
told they have new cores for cam.


Make sure you clarify this with them. 2 years ago I had a couple of cam ground on 'new' cores... and they
were rear journal grooved like the hydro lifter cams are... this isn't a really big deal for a drool tube
head as the lifter bays are open and can drain the excess oil to the top end...on the 1975+ heads the pushrod
holes can't drain that much oil (especially at high rpms) and the rear part of the head will have a lake of oil that
will eventually inundate the valve cover seal and make a nice mess... (I ended up modifying a valve cover and
using RTV to 'contain the situation'...but that's a poor excuse for engineering a solution at best...FYI).


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PostPosted: Tue May 15, 2018 2:13 pm 
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Joined: Mon Oct 21, 2002 11:08 am
Posts: 12597
Location: Blacksburg, VA
Car Model*:
I would suggest using an old core (used, regrind). They sometimes have them.

Since you are in Finland, I would be happy to donate one of my used cores to help you out, if they do not have them. I was planning to send them a few cores to grind cams soon anyway.

Best wishes,

Lou

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PostPosted: Tue May 15, 2018 2:31 pm 
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Joined: Tue Oct 29, 2002 8:27 pm
Posts: 9523
Location: Salem, OR
Car Model*:
I live 1 hour to the south and have 1 OEM 1970's mech cam core left and could hand deliver it to them for Gas Money as another option...


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PostPosted: Thu May 17, 2018 11:11 pm 
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TBI Slant 6
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Joined: Tue Aug 19, 2003 3:52 am
Posts: 153
Location: Helsinki Finland
Car Model*: 1966 2D Dart
I have sent an inquiry about this

1475 on the intake and 791 on the exhaust, with 106 LSA and degree it at 100 deg intake centerline

to Oregon Cams. Is much much hotter than
I thought to be possible. Lets see what I get.

Plan is build this setup for year 2019. It is always
good to have plans...

I have had splitter (2plane divider) inside Clifford
manifold but I assume it is time to go back to
single plane. I probably build a next generation
"fuelie" with some new tricks for this new setup too.

As cam is now selected I can contact Edgeracing for converter issue.

_________________
LL21A6_/6 running with fuel made from biowaste (ethanol).


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PostPosted: Fri May 18, 2018 1:36 am 
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Joined: Mon Oct 21, 2002 11:08 am
Posts: 12597
Location: Blacksburg, VA
Car Model*:
The 225 works well with quite a lot of cam (overlap) due to the valve size vs. cylinder displacement.

Enjoy the planning and Slanted building...

Lou

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