Re: Cross flow head [2 Attachments]

[Frank Graham]

Thank you Peter, I didn t have the information with me yesterday but it was indeed Jan Roelof who made the cross flow head for me. Regards, Frank frankgraham@msn.com 

On Feb 14, 2019, at 7:43 PM, dick little vze4xyru@gmail.com> wrote:

Hi Frank, Thank you for a lot of information I never knew. Clever idea to put a plate on top of the base casting. A bit "out of the box", I think. And well done for that idea! Cheers and very best wishes, Dick On Thu, Feb 14, 2019 at 4:52 PM Frank Graham frankgraham@msn.com [mg-tabc] mg-tabc-noreply@yahoogroups.com> wrote: [u][/u]   Dick, A number of years ago Andy King in the UK had a batch of 8 port cross flow alloy heads cast, these may have been copied from an earlier design. The heads had a number of problems due to porosity that allowed water to leak into the oil and also into the intake and exhaust ports.  At least some of theses heads also had the position of the rocker pedestals machined incorrectly too. The head I have was machined from a block of aluminum, not cast. For this to work the head has a top plate that seals the water passage that is bonded and bolted to the main part of the head. The fellow who made this head owns a TC has been making machined alloy racing heads for water cooled motorcycles and heads for engines used in tractor pulls using this technique for years. The very first cross flow head he made was installed several years ago on a Dutch supercharged XPAG TA/Q special and it runs well. Here are two photos of the unfinished cross flow head while it was being made. The Laystall head was not cross flow, it was essentially a cast alloy copy of the stock cast iron head but with bigger valves, ported and polished ports, and smaller combustion chambers giving about 9.0:1 compression as a bolt on. I have been running an original one on my TC for over 40 years. Peter Edney in the UK has modern copies of this alloy head available for about $2350.  Frank [b]From:[/b] dick little vze4xyru@gmail.com> [b]Sent:[/b] Wednesday, February 13, 2019 4:51 PM [b]To:[/b] Frank Graham [b]Subject:[/b] Re: [mg-tabc] Cam Replacement   Hello Frank, I am impressed.  Who designed it? Not a trivial exercise! Is some one casting and machining them there? Wasn't there a Laystall crossflow head many years ago? Maybe it was simply a sophisticated siamesed aluminum head. Thank you for telling me about it. Very best wishes, Dick On Wed, Feb 13, 2019 at 4:09 PM Frank Graham frankgraham@msn.com> wrote: Dick, Had it made in Holland, machined from a billet of aluminum. Frank [b]From:[/b] dick little vze4xyru@gmail.com> [b]Sent:[/b] Wednesday, February 13, 2019 3:58 PM [b]To:[/b] Frank Graham [b]Cc:[/b] mg-tabc@yahoogroups.com; Gene Gillam [b]Subject:[/b] Re: [mg-tabc] Cam Replacement   Out of curiosity, where does one find an XPAG crossflow head? Probably in the same aisle as the box of hen's teeth! I have an MPJG in the TA, so a crossflow head would be at least two orders of magnitude more power. Dick Little TA1326 On Wed, Feb 13, 2019 at 2:52 PM Frank Graham frankgraham@msn.com [mg-tabc] mg-tabc-noreply@yahoogroups.com> wrote: [u][/u]   Gene, Now that the issue of failed circlips has been raised, is the circlip still intact? When you say that you used Moss parts did that include a new drive gear, shaft and circlip? You obviously have a lot of money sunk into this engine already so it would be nice to know what caused the failure before re-assembling it and hoping it doesn't happen again. I am particularly interested since I am planning to build up a very similar engine but with an 8 port cross flow head. Frank [b]From:[/b] mg-tabc@yahoogroups.com mg-tabc@yahoogroups.com> on behalf of Gene Gillam anngene@bellsouth.net [mg-tabc] mg-tabc-noreply@yahoogroups.com> [b]Sent:[/b] Wednesday, February 13, 2019 1:32 PM [b]To:[/b] mg-tabc@yahoogroups.com [b]Subject:[/b] Re: [mg-tabc] Cam Replacement     Thanks for the input... Just so you know, the radiator has to come off and the front motor mounts have to be removed before you can jack up the engine to remove the oil pump. To answer some of the questions. The engine has less than a 1000 miles on it since being built. It has Len s roller cam, billet crank, Saenz rods and J&E pistons. It s a later TD engine with the later TD oil pump and yes, the pump was rebuilt using Moss parts. The gear is held on by a solid pin, not a roll pin. I am expecting to have to replace the cam but the reason I don t want to pull the engine is SPACE. The garage space it s in is barely longer than the car and I don t want to move it to the larger garage because I don t want to leave my wife s car outside until I finish the job...that s why I was asking about doing it with the engine in place. Best regards, Gene Gillam Sent from my iPhone > On Feb 13, 2019, at 05:22, John Seim kingseim@earthlink.net> wrote: > > Not that hard. Requires oil pan off, as well as radiator removal. > You should be able to turn the engine with a crank or socket, and inspect the cam gear. > I suspect that the pump gear came from Moss, and was held onto the shaft with a roll pin. > Fine for the list., not so good for the oil pump, and it s load. > > John Seim > >> On Feb 12, 2019, at 2:23 PM, Eugene F Gillam anngene@bellsouth.net [mg-tabc] mg-tabc-noreply@yahoogroups.com> wrote: >> >> How hard is it to change out a cam with the engine in the car? I was warming up my engine in the garage the other day, temperature coming up nicely, oil pressure running between 65/70 (normal this engine) when all of a sudden there were loud noises and the oil pressure dropped to 0. The engine kept running normally. >> >> I pulled the oil pump yesterday and found the oil pump gear that meshes with the cam was missing a tooth and several other teeth were damaged.... I ve ordered an endoscope so I can look at the cam in the engine but I m expecting the worst. >> >> I ve built several engines from the ground up outside the car but want to avoid having to pull it if not necessary. >> >> Thanks in advance, >> Gene Gillam >> Saucier, MS >> Sent from my iPad >> >> >> ------------------------------------ >> >> >> ------------------------------------ >> >> Yahoo Groups Links >> >> >> >> >