XRV8 Gremlin

Geeze, worst oil pump! Like what kind of volume does a stock oil pump got, or is it too much spring?

Glad ya did get it going and I bet it sounded great, outside of the exhaust flange leak.

Happy to see you got it going, and will be running about in the summer.

That's what I was thinking... need to work on that oil pressure relief valve! 80 psi cold at idle, or at what rpm? If at idle it would be well over 100 at much above, and way to high even hot! I think TomJ had issues with his blueprinted 196OHV pump being too tight an d creating too much pressure -- had to loosen it up.

Showing simple construction and weight of clamshell hood (29 lbs.):


















Edited by amcenthusiast - May/01/2017 at 12:10am

Hello, yes thin, light, no props; just remove four corner pins lift off entire hood -easy.

Showing info pages from D. Elgin to describe 443's new cam:







AMC-1 (solid line) is stock cam, AMC-2 is the new cam cut for 443








Edited by amcenthusiast - Jun/22/2017 at 11:48pm

XRV8 Race Parts Info Pak:
-----------------------------

RV8 VALVE SPRINGS:

Spring seats; factory cut measures 1.38" outside diameter, having a raised ridge preventing larger diameter (spring, shim or cup) from seating correctly.

Pressed in valve guide has 'step' at base of guide: .916" to .925" diameter x .100" tall.


(valve guide, upper portion, for valve stem seal = .600" for push on 'positive' type seals)


----------------------------

Valve Springs, stock RV8:

   Melling VS-500:

   My '64 327 2bbl springs:
      (single/no damper)
          1.29" OD
          .940" ID
      2.330" free length
               
    

RV8 4bbl uses slightly higher rate spring w damper.

       1.29" OD
    .840"to.850" ID
      with it's own
     unique notched
     spring retainer
    
RV8 4bbl retainer has damper spring notch and reduced total thickness below valve locks for slight increase in retainer to valve stem seal clearance for running a higher lift cam. 
         

----------------------------

VALVE SPRINGS, OEM type, possible interchange pn#s

(Outer) similar:

          Elgin pn#RV863S
          1.322"/1.342"OD
          .948"/.968"ID
          95/105lbs.@1.812"
          188/202lbs.@1.437
          coil bind @ 1.437"

          Melling pn#VS360
          1.380"/1.400"OD
          1.010"/1.03'ID
          121/129lbs.@1.86"
          192/208lbs.@1.43"
          coil bind 1.350"
          .185 wire size
          2.580' free height
         
          Melling pn#VS460
          1.384/1.404"OD
          1.00/1.02"ID
          80//88lbs.@1.812"
          210/226lbs.@1.365"
          1.3" coil bind
          .192 wire size
          2.2" free height

          Melling pn#VS1010
          1.365/1.385"OD
          1.011/1.03'ID
          62-73lbs.@1.90"
          155/185lbs.@1.30"
          1.1940" coil bind
          .177 wire size
          2.3250" free height
         
          see also VS11330

----------------------------

VALVE SPRINGS, AFTERMARKET:

(OUTER)

Comp Cams

pn#910

1.354"OD .940ID
92lbs.@ 1.85"
300lbs.@ 1.35"              
415lb spring rate
with damper


Crower

pn#68143
1.354"OD .940"ID
92lbs@1.850'
300lbs@1.350"
415lb spring rate
wire size .208
free length 2.075"


Isky pn#205-G
         
1.240"OD .925"ID
spring rate 170lbs.


----------------------------

INNER SPRINGS:

Ignoring use of aftermarket retainers, these inner springs will need stock spring retainers notched to adapt & valve guide diameter cut down to .530" -can't use stock umbrella or SP 2011 (.700"OD) type valve seals. (stock pressed in guide diameter: .600")

        Sealed Power Vintage
        VS-527 LH coil fits             inside stock RV8             Melling VS-500 RH coil
        *for Buick Nailhead

        Elgin pn#RV692S
          .910"/.925"OD
          .670"/.685"ID
          23/28lbs.@1.690"
          73/79lbs.@1.250"
          coil bind @ 1.140"
           'single'
          *for Buick Nailhead

*use Comp Cams viton metal clad, pn#515-16 for .530" guide, stated to have .670" OD but this seal barely fits inside SP VS-527


Melling's VS-2203 & VS-2230 dimensions are not correct on Melling's valve spring chart (No; they don't fit inside stock RV8 valve spring)
 

-----------------------------

DUAL VALVESPRINGs:
(aftermarket kits)


Crower:
(480-500" lift hyd/solid lifter)

pn#68448
1.850" installed height
1.290"OD 1.055"ID outer
.890"OD .650"ID inner
302lb spring rate:
129lbs@1.850"
276lbs@1.350"
2.380"freelength

*inner spring fits on stock RV8 guide 'ledge'. -must cut guide to .530' & use CompCam pn#505 PTFE seal w .630" OD, needs retainer for 3/8" valve stems...


Crower: roller cam

pn#68851
1.950"installed height
1.380"OD 1.0"ID outer
.980"OD .710"ID inner*
402lb spring rate


-----------------------------

RETAINERS:

Comp Cams Pn#744-16?

      1.40"OD to 1.060"
         with 690"ID
      (7d for 3/8" stem BBC)

Engine Works Pn#

     (I used +.050" EW retainer for 1.4" OD spring with spring steps re-cut for stock Melling VS-500 ID outer & SP VS-527 inner... then I trimmed retainer's top diameter to about 1.35' for lightening and put a 45 degree chamfer top cut to finish the resulting custom product)



-----------------------------
        
LOCKS:

Sealed Power:

Use SP VK-174R (4G, hardened)

*DO NOT USE VK-174 (4G, not hardened)
 

Comp Cams' "Street Locks":

          pn#604-16
        'Chrysler 4G'
          (hardened)
          3/8" stem
          7 degree

----------------------------

VALVE STEM SEALS:

(RV8 valve stems are .3720" not .3725" diameter... this may be an engineering debate where the AMC engineers decided they want the extra .0005" clearance for valve stem thermal expansion)


Sealed Power pn# ST-2004
-fits stock .600" guide


interchange pn#s?:
 
Enginetech EPC746-HD, Federal Mogul VK-66, Melling VL-100

or

Comp pn#4726 vguidecutter .530"

to use

Comp pn#515-16 3/8" stem Viton seals .530"ID/.675 OD*

*pn#515-16 actually measures . 670" outside diameter


      
----------------------------

PUSHRODS:

stock pushrod sizes:

8.687" long by .275" diameter, ball & ball, no oil hole type *note they are not 1/4" (.25")


Manton Pushrods Catalog:

http://mantonpushrods.com/wordpress/wp-content/uploads/2014/01/manton2014_catalog.pdf


Sealed Power's pushrod for RV8 pn# RP-3083


Comp Cams sells 'cut to fit' pushrod kits.

-check out Comp pn# 8466-16

Isky lists pushrods for RV8 on pgs.47 in their online catalog;
 http://www.iskycams.com/downloads/2016IskyCatalog.pdf

-they make custom pushrods

Galvins AM Rambler Parts


----------------------------


Aftermarket Big Block Chevy connecting rod lengths*:

6.535" 6.635" 6.660" 6.7" 6.8"

'2.2" journal'

-adapt Chevy Gen1 SB pistons by drilling-reaming-honing .927" wrist pin bores to .990" size; this 'opens up' availabile use of many 'race ready' oversize wrist pins made for BBC engines.

*Eliminates 'non-available' connecting rod bolts for stock RV8 rods, but allows 'race rod bolts' for BBC engine instead.


----------------------------

"XRV8 STROKER" PLANS:


287 max overbore: 3.75" + .5 (.25" wall x 2) = 4.25

Using .1720" minimum acceptable wall thickness (about 5/32"?) = .1720" x 2 = .344"

Max recommended bore
size for 287:
 
4.25"- .344" = 3.906"


(3.906" = '287 RV8 punched out to the max' with .1720" thin walls remaining*)

----------------------------


'Best' stroke to use with stock 6.375" Rambler V8 connecting rod?:

6.375" / 1.68 (optimal rod ratio) = 3.79" stroke

 
----------------------------


287 stroker using '68-'70 Olds 400 piston (dished)

bore: 3.87

comp dist: 1.737

wrist pin: .980

deck height 9.973" - 1.737" = 8.236" - 6.375" = 1.861" x 2 = 3.722" stroke

1.861" - (3.25"/2=) 1.625" = .236" built up journals

3.87" bore x 3.722" stroke = = 351 CID

rod ratio = 1.62


----------------------------

287 using Chevy 283 piston (flat top)


3.875" bore (3.9" @ .030" overbore)

1.7969" compression distance (1.8")



9.973" (RV8 deck height) - 6.375" (RV8 rod length) = 3.598"

3.598" - 1.8" (SBC 283 comp dist.) = 1.798" x 2 = 3.596" stroker crank

3.596" - 3.25" (stock RV8 stroke) =  .346' / 2 = .173" built up journals

( 3.25" / 2 = 1.625" (half stroke) + .173" built up journal = 1.798" x 2 = 3.596" stroke)

6.375" (stock RV8 rod length) / 3.596" stroke = 1.77 rod ratio

3.875" bore x 3.596" stroke = 339.2 CID



------------------------------------------


287 RV8 stroker build using SBC 305 piston:

9.973" deck height - 6.535" rod ($252 BBC) = 3.438" - 1.56' comp dist (Chevy 305 030 = 3.76" bore) = 1.878 - (3.25/2=) 1.625" = .253" built up stroke (1.878 x 2 = 3.75" stroke)

6.535" rod / 3.75" stroke = 1.74 rod ratio

3.76 bore x 3.75 stroke = 333.109 CID

------------------------------------------------------------------------------------------
   
https://plus.google.com/106358430530058382730/posts/2KEqTS6XcgS

-------------------------------------------------------------------------------------------

442.7 CID XRV8 Engine Specifications
 
experimental welded stroker Rambler V8 (327) using SBChevy 400 .030" TRW L2376F piston

Bore 4.155"

Compression distance 1.557"

4bbl 327 Rambler V8 compression distance 1.973 - 1.557 = .416 x 2 = .832 + 3.25 = 4.082" stroke

bore/stroke ratio 1.017:1

rod length 6.375

rod ratio = 1.56

calculated displacement 442.78 CID or 7255.97 CC


---------------------------

additional calculations

---------------------------

442.7 XRV8 Crankpin Overlap

rod journal 2.25" / 2 = 1.125

main journal 2.5" / 2 = 1.25

stroke 4.082" / 2 = 2.041

1.125 + 1.25 = 2.375

2.375 - 2.041 = .334"

= 5/16"+ Crankpin Overlap

---------------------------

http://victorylibrary.com/mopar/rod-tech-c.htm

indicates 443 XRV8 should use larger intake port induction system (wherefore 900 cfm dual four bbl on large tapered runner single plane intake works excellent)

-----------------------------

327 RV8 Stock rod 6.375 + stock pin distance 1.973 = 8.348 + 1/2 stroke 1.625 = 9.973" deck height calculation

442.7 XRV8 rod 6.375 + 1.557 pin distance = 7.935 + 1/2 4.082 stroke 2.041 = 9.973

----------------------------

443 XRV8 Piston Speed?

-from Victory Library:

4000 ft./min., the accepted “safe” limit for piston stress...

(EPI says max MPS is 3000)

using 'mean piston speed' formula MPS = RPM x stroke/6

6000 x 4.082/6 = 4082

5500 x 4.082/6 = 3741

5000 x 4.082/6 = 3401

4500 x 4.082/6 = 3061

...so 4500 is max 'safe rpm'?

*My precision balanced 443 XRV8 engine tachs up to 4000 in a split second nice and easy/no noticable strain whatsoever...
 
& EPI notes 4390 feet per minute for his SBC having 1.525 rod ratio @ 4000 rpm

----------------------------

longer rod choice?

RV8 rod 6.375 + 1.56 = 7.935 - (SBC 400 using 5.75" rod piston comp. dist.= 1.425 indicates using aftermarket BBC 6.51"  long custom connecting rod

9.972" - 1.425" = 8.547" - 6.51" rod = 2.037" (half stroke) x 2 = 4.074" stroke

4.074" stroke / 6.51" rod = 1.59 rod ratio 

*Using BBC 6.8 rod having 2.2 journal & piston comp distance 1.425 destrokes to 3.92 and yields 1.73 rod ratio?

Rambler 327 bored .060" = 4.060" bore x 3.92" stroke = 


---------------------------

'Best 327 RV8 stroker'?


6.375" RV8 rod / 1.68 rod ratio = 3.79 stroke



4.030" bore

4.030 / 90% = 3.627 optimal stroke

6.375" rod / 3.627 = 1.757 rod ratio



4.060" bore

4.060 / 90% = 3.654 optimal stroke

6.375" rod / 3.654 = 1.74 rod ratio



4.080" bore

4.080 / 90% = 3.67 optimal stroke

6.375 / 3.67 = 1.737 rod ratio 



4.125" bore

4.125 / 90% = 3.71" optimal stroke

6.375" rod / 3.71 = 1.718 rod ratio



9.973" RV8 deck height - 6.375" rod = 3.598 - 1.67 (SBC 327) = 1.928 x 2 = 3.856 stroke

6.375 / 3.856 = 1.65 rod ratio



... 'best?' piston = SBC 327 (+.080, 1.67" compression distance) 4.080" bore x 3.856" stroke = 403 CID    

----------------------------

'Best' 327 stroker using Chevy Big Block 6.535" aftermarket rod/

(rods can be purchased sometimes for about $250 + $40 for BBC rod bearings = about same cost for RV8 rod bearings for stock rods! Plus, you get the BBC rod bolts in the deal, which are replaceable, for future rebuild potential)

9.973" RV8 deck height - 6.535" BBC aftermarket rod = 3.438" - 1.56" (SBC 350/400 piston compression distance) = 1.878" (half stroke) x 2 = 3.756" stroke

BINGO: There it is!

Using 4.125" piston / 90% for optimum bore to stroke ratio = 3.71"

Using BBC aftermarket 6.535" rod / 3.756" stroke = 1.739 rod ratio

(good rod ratio to maximize potential of RV8 heads)

4.125" bore x 3.756" stroke = 401.56 CID

Hence, 'Best' 327 stroker having 90% bore to stroke ratio with 1.7 rod ratio to optimize potential of RV8 heads = RV8 block + BBC 6.535' rods + SBC 4.125" 1.56" comp distance pistons

327 cylinder bores = 4.5" outside diameter

4.5" - 4.125" = .375" (3/8")

= .1875" (3/16") cylinder wall thickness remaining using SBC 4.125" pistons... where .1720" (11/64") is generally minimum acceptable cylinder wall thickness for Ford FE V8 examples

This size cylinder can be rebuilt/serviced using Cadillac 429/AMC 401 1/8" thick HP sleeves (currently available through Enginetech) *these superior centrifugally cast iron sleeves will actually strengthen the cylinder bores


-suggesting 'short fill' block filler (level filler to lower edges of lowest rear welch plugs in RV8 block) which allows approx. 1" water jacket distance under stock RV8 cylinder wall 'brace buttons' built into stock 'as cast' cylinder wals*

*443 XRV8 engine with short fill does not overheat (keeps it's cool like a stock 327! -no noticeable difference whatsoever)


Edited by amcenthusiast - May/07/2017 at 12:13am