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challomoner
Samba Member
Joined: October 13, 2010
Posts: 1215
Location: IRELAND
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 Posted: Tue Apr 15, 2014 11:44 am Post subject: stock size valves on a 1955cc? |
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As the title states, I'm wondering if stock size valves will support a mild 1955cc engine.
Spec
As41 case
90.5 barrels and pistons
Counter weighted crank, lightened flywheel
Engle 110 cam
1 and 3/8 inch header with stock heater boxes
Dual dell 36's
Tims super stock / drd L3 heads
Engine is going in a late bug, looking for a smooth, cool running motor with hopefully 80-90 hp
Will the stock size valves restrict this motor? Would there be a discernible difference between the 76mm crank and the 69mm if I were to stick to 1776cc?
Thanks in advance
l |
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Dan Ruddock
Samba Member
Joined: October 25, 2012
Posts: 3594
Location: Sarasota, in my adopted state of Florida
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| Posted: Tue Apr 15, 2014 11:50 am Post subject: |
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If you are going to run heater boxes and 1 3/8 exhaust you must run stock valves. Yes you will leave some top end HP on the table but the engine will have real good low end and is a good combo. The bigger crank will give you more torque. Might as well go with a 82mm if your going to buy a crank.
Dan |
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challomoner
Samba Member
Joined: October 13, 2010
Posts: 1215
Location: IRELAND
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| Posted: Tue Apr 15, 2014 12:30 pm Post subject: |
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Thanks Dan, I'm not too concerned about all out hp, I'm looking for something I can use in traffic and for extended periods on road trips. I was just a little concerned that 1955 might be too large for stock valves. Would there be a noticeable difference between the 76mm crank and a 69mm crank with everything else as the spec I posted above?
How would a 2110 run with stock valves? Is it a step up I should consider |
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rockurob
Samba Member
Joined: August 23, 2009
Posts: 358
Location: Okla City, Oklahoma
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challomoner
Samba Member
Joined: October 13, 2010
Posts: 1215
Location: IRELAND
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| Posted: Tue Apr 15, 2014 12:49 pm Post subject: |
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| rockurob wrote: |
If you are going to buy new heads, pay
a little more $$$ BUY
"Big Ones" opt for the bigger valves....
you will wish you hadda !!! 
then you can do anything on the
bottom end and not waste your
efforts and $$$ |
I'm gathering parts for a 2276 motor that will come later perhaps not even in this bug. Have Denham heads and dpr crank ready for that build.
What I want for this motor is something less highly strung that will give me good mileage and won't cost as much to build as the 2276. I already have the dell's and exhaust and a good used case for this build and I'm determined to keep stock heater boxes too so that's.why I'm limiting these heads to stock size valves |
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rockurob
Samba Member
Joined: August 23, 2009
Posts: 358
Location: Okla City, Oklahoma
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| Posted: Tue Apr 15, 2014 1:09 pm Post subject: |
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Sorry, I understand your stock valves ambition
I copied and pasted the below from AJ Sims site
Low Bugget, this is what he did with stock size valve heads:
(I however did clean up the miss-spells, he had a few )
STATS ON THE 1641 ( This motor ran a best of 13.79sec)
AS41 case
69x87
web 118
1.25 rockers total lift of .415 at the valve.
35x32 valves with dual springs. I did all the porting.
the compression was set at 12.5
110gas
stock crank, rods, pressure plate and disk.
lightened flywheel.
stock gearbox 4.12 I do not use 4th
the Kadrons are stock with no changes. I did remove the air cleaners
The 1641 liked to rev. In the burn out box I would hit 8,000rpm's all the time.
leave the light at 7,200 to 7,400 and shift at the same.
103hp at 6,200rps.not bad
I realize you are not going for a high compression build, but
the stock valve size will perform if proper porting is done
_________________
70's....Owner "Der Bug Shoppe" Okla. City
70 Baja Street Rod Project
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Dan Ruddock
Samba Member
Joined: October 25, 2012
Posts: 3594
Location: Sarasota, in my adopted state of Florida
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| Posted: Tue Apr 15, 2014 1:24 pm Post subject: |
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| baz76 wrote: |
Thanks Dan, I'm not too concerned about all out hp, I'm looking for something I can use in traffic and for extended periods on road trips. I was just a little concerned that 1955 might be too large for stock valves. Would there be a noticeable difference between the 76mm crank and a 69mm crank with everything else as the spec I posted above?
How would a 2110 run with stock valves? Is it a step up I should consider |
What ever percentage increase in displacement will get close to equal increase in torque. If a 2110 costs you as much as a 1955, why not? It will work fine no matter the displacement. Dan |
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vwracerdave
Samba Member
Joined: November 11, 2004
Posts: 15308
Location: Deep in the 405
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| Posted: Tue Apr 15, 2014 1:49 pm Post subject: Re: stock size valves on a 1955cc? |
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| baz76 wrote: |
As41 case
90.5 barrels and pistons
Counter weighted crank, lightened flywheel
Engle 110 cam
1 and 3/8 inch header with stock heater boxes
Dual dell 36's
Tims super stock / drd L3 heads
Engine is going in a late bug, looking for a smooth, cool running motor with hopefully 80-90 hp
l |
Awesome combo. Build it and enjoy it.
_________________
2017 Street Comp Champion - Thunder Valley Raceway Park - Noble, OK
2010 Sportsman ET Champion - Mid-America Dragway - Arkansas City, KS
1997 Sportsman ET Champion - Thunder Valley Raceway Park - Noble ,OK |
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Alstrup
Samba Member
Joined: July 12, 2007
Posts: 7216
Location: Videbaek Denmark
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| Posted: Tue Apr 15, 2014 6:39 pm Post subject: Re: stock size valves on a 1955cc? |
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| baz76 wrote: |
As the title states, I'm wondering if stock size valves will support a mild 1955cc engine.
Spec
As41 case
90.5 barrels and pistons
Counter weighted crank, lightened flywheel
Engle 110 cam
1 and 3/8 inch header with stock heater boxes
Dual dell 36's
Tims super stock / drd L3 heads
Engine is going in a late bug, looking for a smooth, cool running motor with hopefully 80-90 hp
Will the stock size valves restrict this motor? Would there be a discernible difference between the 76mm crank and the 69mm if I were to stick to 1776cc?
Thanks in advance
l |
Chose the Tims super stock heads. Ditch the W110 and get a Web 163 instead, then run 1,25 rockers with it. At least 9-1 preferably 9,5-1 CR and that combo will make massive torque and a solid 110 hp.
T |
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challomoner
Samba Member
Joined: October 13, 2010
Posts: 1215
Location: IRELAND
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| Posted: Wed Apr 16, 2014 10:49 am Post subject: Re: stock size valves on a 1955cc? |
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| Alstrup wrote: |
| baz76 wrote: |
As the title states, I'm wondering if stock size valves will support a mild 1955cc engine.
Spec
As41 case
90.5 barrels and pistons
Counter weighted crank, lightened flywheel
Engle 110 cam
1 and 3/8 inch header with stock heater boxes
Dual dell 36's
Tims super stock / drd L3 heads
Engine is going in a late bug, looking for a smooth, cool running motor with hopefully 80-90 hp
Will the stock size valves restrict this motor? Would there be a discernible difference between the 76mm crank and the 69mm if I were to stick to 1776cc?
Thanks in advance
l |
Chose the Tims super stock heads. Ditch the W110 and get a Web 163 instead, then run 1,25 rockers with it. At least 9-1 preferably 9,5-1 CR and that combo will make massive torque and a solid 110 hp.
T |
Thanks, I like the sound of masses of torque.
2 more quick questions, are the Tims super stock heads good to go straight out of the box or would they need more porting work?
What would be the best size crank for this combo? Should I step up to 82mm to give me 2110? Is there not a point where the stock valves, small exhaust and 36's will be detrimental to the performance? |
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74 Thing
Samba Member
Joined: September 02, 2004
Posts: 7391
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| Posted: Wed Apr 16, 2014 11:42 am Post subject: |
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| And do you need dual springs for the Web 163 cam and 1.25 rockers? |
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Alstrup
Samba Member
Joined: July 12, 2007
Posts: 7216
Location: Videbaek Denmark
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| Posted: Wed Apr 16, 2014 12:08 pm Post subject: |
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Wrt crank. - I like the 1955 cc combo as it can deliver nice overall power. If you want to stay with the 36 Dells and a 1 3/8" header, there is definitely no idea in increasing displacement.
A port´n polish of the heads can almost always free up more hp. I think you can order that from Tims, and I think Brothers offer such a solution. However, if that is done I do think you need to step up to a 1½" header to take advantage of that.
Remember, it is much better to build a smaller engine that works well than a large engine that is mismatched.
The 163 w. 1,25 rockers does not need dual springs in such a set up because it has peaked well before the springs give in. It does need a perfekt geometry though, and I use to shim the springs (Scat or even better Oteva) rather close to max and then limit the engine to 6000 rpm. It will rev 6300 at least without problems, but 6 grand is well beyond peak power with the above set up.
T |
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challomoner
Samba Member
Joined: October 13, 2010
Posts: 1215
Location: IRELAND
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| Posted: Wed Apr 16, 2014 12:22 pm Post subject: |
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| Alstrup wrote: |
Wrt crank. - I like the 1955 cc combo as it can deliver nice overall power. If you want to stay with the 36 Dells and a 1 3/8" header, there is definitely no idea in increasing displacement.
A port´n polish of the heads can almost always free up more hp. I think you can order that from Tims, and I think Brothers offer such a solution. However, if that is done I do think you need to step up to a 1½" header to take advantage of that.
Remember, it is much better to build a smaller engine that works well than a large engine that is mismatched.
The 163 w. 1,25 rockers does not need dual springs in such a set up because it has peaked well before the springs give in. It does need a perfekt geometry though, and I use to shim the springs (Scat or even better Oteva) rather close to max and then limit the engine to 6000 rpm. It will rev 6300 at least without problems, but 6 grand is well beyond peak power with the above set up.
T |
Thanks again Alstrup. I'll take your advice on sticking to 1955cc, also leaving the heads alone, I like the KISS approach with this motor, and I'm gonna try out the Web 163 for sure.
Looking forward to trying out this combo, I'll be sure to post back with feedback once it's done
Thanks |
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