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Re: another 3.79 vs 4.00 vs 4.125 sb stroke comparisons
[Re: mopster]
#1544616
12/08/13 01:00 PM
12/08/13 01:00 PM
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Joined: Apr 2009
Posts: 3,414
Toronto
mshred
master
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master
Joined: Apr 2009
Posts: 3,414
Toronto
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Quote:
Going for shorter stroke is a wrong move unless you race in a bad track and you have trouble hooking. If you are looking for more power, playing with different strokes and rod ratios isnīt going to do the trick. Keep the 4" stroke and use the money to increase the airflow and you will be much happier.
I don't know alot, but I would have to agree with this. In fact, I would be more inclined to go up in stroke instead of down if for nothing other then the extra torque it would create and at less rpm (better longevity of valvetrain parts), but the rest of the setup would have to be optimized.
I think a compression bump with what you already have would work out well
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Re: another 3.79 vs 4.00 vs 4.125 sb stroke comparisons
[Re: mopster]
#1544617
12/08/13 01:04 PM
12/08/13 01:04 PM
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Joined: Jan 2007
Posts: 8,031
Mt Morris Michigan
mopar dave
OP
master
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OP
master
Joined: Jan 2007
Posts: 8,031
Mt Morris Michigan
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I think the car hooks great. could use a double adjustable on the rear to improve 60' abit. It seems the 408 isn't making enough power to move the car for better ET's. car weights 3300 and runs 10.35@130. I estimate 580-600hp off motor. one reason I believe this is just by changing ignition box from a Mallory hifire6 to an Ice 7amp box and coil, 60' went from a 1.52 to mid 1.4's.
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Re: another 3.79 vs 4.00 vs 4.125 sb stroke comparisons
[Re: mopar dave]
#1544618
12/08/13 01:26 PM
12/08/13 01:26 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
I think the car hooks great. could use a double adjustable on the rear to improve 60' abit. It seems the 408 isn't making enough power to move the car for better ET's. car weights 3300 and runs [Email]10.35@130.[/Email] I estimate 580-600hp off motor.
one reason I believe this is just by changing ignition box from a Mallory hifire6 to an Ice 7amp box and coil, 60' went from a 1.52 to mid 1.4's.
If you change just the ignition box and you picked
up that much you had a major problem in the ignition
but your 60' is still off(slow) based on the ET & MPH
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Re: another 3.79 vs 4.00 vs 4.125 sb stroke comparisons
[Re: mopar dave]
#1544620
12/08/13 01:48 PM
12/08/13 01:48 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
yeah, that's why I believe it could use some better shocks. i'v got a ton of vids and the tire is not spinning. the vert works good, it falls back about 700rpm on the shift. sometimes I wonder if something is binding or rubbing together in the trans. been temped to call up john cope and get a brand new 727 from him.
anyway, I do believe the Ice ignitions are something to look at over msd, Mallory for sure as i'v had a bunch.
I had a Mallory ignition when I first built my car...
that lasted 2 weeks... when I called them they gave
me a bunch of BS and that I was using it in the
wrong environment... as in a race car.... they said
they would fix it for a cost.... I trashed it and
moved on.... as for the trans.. I dont know but the
MPH is there so to me its making the power(and getting
it through the trans)... if it were not the MPH would
be down
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Re: another 3.79 vs 4.00 vs 4.125 sb stroke comparisons
[Re: mopar dave]
#1544622
12/08/13 02:01 PM
12/08/13 02:01 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
yeah mike, but it seems like the combo should be more like 625-650hp with what I have. I agree with the Mallory stuff. i'v had a earley hifire box that broke me down twice a Mallory fuel pump that gave me fits a Mallory unilight that the bushings wore out in no time flat, so I understand where your coming from. I thought the hifire6 was a nice box with a lot of features,guess not. my worst box was a msd digital6. I still have a Jacobs that works great.
I have hear more people with problems with the digital 6
boxes than ones that didnt... I wont buy one for that
reason
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Re: another 3.79 vs 4.00 vs 4.125 sb stroke comparisons
[Re: mopar dave]
#1544623
12/08/13 02:31 PM
12/08/13 02:31 PM
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Joined: Feb 2005
Posts: 982
western pennsylvania
b1dartsport
super stock
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super stock
Joined: Feb 2005
Posts: 982
western pennsylvania
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If you are interested in getting to the other end of the track the quickest and want to continue to use your 360-2 230 cc Indys, there was a combo that was well documented on here and was the fastest 230 cc combo I have ever seen or heard about. I believe the car was an early 70s dart swinger owned by John Pennington. It had a 4.07 bore,Scat 4" crank, Eagle 6.123 H beams,stock block,nothing trick about the short block at all. (no chevy rods,light weight pins or trick ring pack) The heads had 2.15 Ferea intake valves installed and valve job and port and chamber work to take advantage of the larger valves. It had an Indy intake that was port matched and had some minor plenum mods. The cam was an Indy spec cam 279/279 @.50 .680/.680 108 LSA installed at 108. Chambers were 63cc and compression was at 13.5 with an off the shelf piston. Off the shelf wet sump oil pan,vacuum pump,1000 Race Demon Carb,2" Hedman Husler headers,727 with a mid 5000 converter. At 3100# this combo went 9.20s to 9.30s at more than 142 mph. I saw this car run in 2005 and still have not heard of any Indy 360-2 230 that was faster at that weight. As said before I think you would be better off staying with the 4" crank,more compression and focusing on getting the head and cam combo to work better.
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Re: another 3.79 vs 4.00 vs 4.125 sb stroke comparisons
[Re: mopar dave]
#1544629
12/09/13 12:19 AM
12/09/13 12:19 AM
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Joined: Jan 2003
Posts: 11,709
Portage,michigan
B3422W5
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 11,709
Portage,michigan
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Quote:
yeah mike, but it seems like the combo should be more like 625-650hp with what I have. I agree with the Mallory stuff. i'v had a earley hifire box that broke me down twice a Mallory fuel pump that gave me fits a Mallory unilight that the bushings wore out in no time flat, so I understand where your coming from. I thought the hifire6 was a nice box with a lot of features,guess not. my worst box was a msd digital6. I still have a Jacobs that works great.
With the dinky 260@ 50 cam your running and just over 11 to 1 compression your not gonna come close to making 650 horse with that combo. Sorry, but just telling you the truth.
You know my d combo, which I figure made an honest 650 running at your weight or a hair more. It was about 5 tenths and 5 mph quicker than you are . So a very big difference from where your at.
If you are really looking to make power, you need to really step things up in the camshaft and compression departments, assuming the heads are real good.
Otherwise your just nibbling at the edges of truly stepping things up and improving your ET.
It can make that power and still see street duty( drove mine way more than 100 miles a summer) you just need to decide on what you want the car to run and use parts that will allow it to do so.
69 Dart GTS A4 Silver All steel, flat factory hood, 3360race weight
418 BPE factory replacement headed stroker, 565 lift solid cam
Best so far, 10.40 @127 1/4
1.41 best 60 foot
6.60 at 103.90 1/8
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Re: another 3.79 vs 4.00 vs 4.125 sb stroke comparisons
[Re: B3422W5]
#1544630
12/09/13 01:36 AM
12/09/13 01:36 AM
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Joined: Jan 2007
Posts: 8,031
Mt Morris Michigan
mopar dave
OP
master
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OP
master
Joined: Jan 2007
Posts: 8,031
Mt Morris Michigan
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yeah, I know. the 260 cam is in their to match the 11:1 compression and I did make improvements in ET going that route. 2 tenths improvement. the next combo will obviously get a bigger cam to match the 13:1+ compression. ran a best of 10.35@130 and 10.39@131. this thread was started to just get some direction on next combo with this block. the results of the leak down test shows I can run this combo another season, but it will have huslers a vacuum pump and a davinci dominator and I may have sanchez take a look at the heads for the next combo though.
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