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Re: Indy 400-I4 t ram mod [Re: Cab_Burge] #3031724
04/07/22 11:46 PM
04/07/22 11:46 PM
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Mt Morris Michigan
mopar dave Offline OP
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I use a 71 400 cover and with my ATI damper it is dead on 0 at TDC. Just checked it and more accurate than i thought it would be.

Re: Indy 400-I4 t ram mod [Re: mopar dave] #3031736
04/08/22 01:28 AM
04/08/22 01:28 AM
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Bend,OR USA
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Originally Posted by mopar dave
I use a 71 400 cover and with my ATI damper it is dead on 0 at TDC. Just checked it and more accurate than i thought it would be.
up Good work up
Never ASS U ME anything stock is correct scope


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: Indy 400-I4 t ram mod [Re: Cab_Burge] #3031786
04/08/22 09:01 AM
04/08/22 09:01 AM
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Mt Morris Michigan
mopar dave Offline OP
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Being that the 400 is a different stroke than the 511, you would think it would be off. Maybe just got lucky there?

Re: Indy 400-I4 t ram mod [Re: mopar dave] #3031789
04/08/22 09:12 AM
04/08/22 09:12 AM
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Lake Villa Il
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Originally Posted by mopar dave
Being that the 400 is a different stroke than the 511, you would think it would be off.


Why is that?


69 Charger. 438ci Gen2 hemi. Flex fuel. Holley HP efi. 595rwhp 475rwtq.
Re: Indy 400-I4 t ram mod [Re: INTMD8] #3031797
04/08/22 10:01 AM
04/08/22 10:01 AM
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Mt Morris Michigan
mopar dave Offline OP
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Longer stroke would push the piston to the top quicker.

Re: Indy 400-I4 t ram mod [Re: mopar dave] #3031799
04/08/22 10:32 AM
04/08/22 10:32 AM
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Lake Villa Il
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Crankpin to keyway location remains the same no matter what the stroke is.


69 Charger. 438ci Gen2 hemi. Flex fuel. Holley HP efi. 595rwhp 475rwtq.
Re: Indy 400-I4 t ram mod [Re: INTMD8] #3031801
04/08/22 10:37 AM
04/08/22 10:37 AM
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Mt Morris Michigan
mopar dave Offline OP
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Ok, maybe im thinking it wrong. Just thought with longer stroker top dead center would be different. Always learning.

Re: Indy 400-I4 t ram mod [Re: Tig] #3031813
04/08/22 11:42 AM
04/08/22 11:42 AM
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Motor City
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Originally Posted by Tig
It seems Indy re-designed them. Not exactly sure which way round chronologically, I think maybe the later T/R's have less bolts for the top ?.
It seems my memory is incorrect, mine DOES have a divider. Date on the photo's are from roughly when it was purchased and kindly sent by Todd Marsh (Sasquatch) many moons ago.

Originally Posted by 6PKRTSE
Originally Posted by Tig
Going to try this, having a 9/16 phenolic spacer machined up very soon.

I fabbed up some 1/2" thick anti-reverson plates for under my carbs and also 1/2" thick delrin/nylon insulator/spacer for my tunnel ram. If you look closely it is the white portion between the intake and top plate. I made several and tried none and up to 4 spacers on dyno with no significant power or torque improvements over not having any. Choose to just use the one to help keep the top plate and carbs cooler.


Hmmm....useful to know. Probably won't make any difference then, my carbs are hanging in the breeze anyway.

[Linked Image]
[Linked Image]


My tunnel ram looks just like that inside but I and blended it all over.


1963 Belvedere 440 Max Wedge Tribute
1970 Charger R/T S.E. 440 Six Pack
1970 Challenger R/T, 528 Hemi
1970 Charger 500 S.E. 440 4 BBL
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Re: Indy 400-I4 t ram mod [Re: mopar dave] #3031818
04/08/22 11:52 AM
04/08/22 11:52 AM
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Bend,OR USA
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Originally Posted by mopar dave
Longer stroke would push the piston to the top quicker.

Not really, RPM is RPM, the longer the stroke the more distance traveled, correct work
Stroker motors suck in more air and fuel than short stroke motors do on the same stroke RPM hence the more power they make. shruggy Thye have more ring travel per RPM so maybe they wear out the rings quicker per mile traveled also work shruggy


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: Indy 400-I4 t ram mod [Re: Cab_Burge] #3031865
04/08/22 02:07 PM
04/08/22 02:07 PM
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A shed in England
Tig Offline
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Originally Posted by Cab_Burge
Originally Posted by mopar dave
Longer stroke would push the piston to the top quicker.

Not really, RPM is RPM, the longer the stroke the more distance traveled, correct work
Stroker motors suck in more air and fuel than short stroke motors do on the same stroke RPM hence the more power they make. shruggy Thye have more ring travel per RPM so maybe they wear out the rings quicker per mile traveled also work shruggy

As I understand it, piston speed is increased and thus piston acceleration. On a theoretical 3.50 stroke and a 5.00 stroke motor, the piston will arrive at TDC at the same time if they were at the exact same RPM. (And that they started in the same place etc etc)
The piston will accelerate quicker away from TDC on the 5.0 stroke motor, it also decelerates quicker to arrive at BDC.
You need good pistons for a big stroke crank grin


'74 Challenger..9.46 and 145.9 so far. 4023lb!!!# N/A, Marsh performance 655ci, Indy Maxx, T/R, Indy 600-13 X's, Street legal, pump gas, full interior, Cal-Tracs, mufflers, 3:73's and real 10.5 radials.
9.51 @142.4 with our old mule 580 wedge
RHD '68 Barracuda Fastback 323ci street/strip. Best ET 13.88 @ 99.03
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